This is an example of how to build a form in Botpress using three different ways

content.yml

misunderstand:
  - I don't understand this.

done:
  - 🎈
  - We're all done then :)

ask_gender:
  - text: What is your gender?
    quick_replies:
      - <QR_MALE> Male
      - <QR_FEMALE> Female

ask_first_name:
  - What is your first name?

ask_last_name:
  - What is your last name?

ask_profile_ok:
  - |
    Here's the info I have on you:
    > First Name: {{fname}}
    > Last Name: {{lname}}
    > Gender: {{gender}}
  - text: Is this correct ?
    quick_replies:
      - <PROFILE_RIGHT> Yes, perfect!
      - <PROFILE_WRONG> No, fix it

welcome:
  - Hello {{user.first_name}} !
  - This is a demo of asking questions on messenger.

profile_wrong:
  - I am sorry to hear that we got your profile wrong. We will fix that now.

index.js

/*
ORIGINAL FLOW MANAGER, CURRENT BOTPRESS VERSION
Description: This is the original bot with the current built-in Flow Manager
Dependencies: This code works as-is. No external dependencies (files).
*/

const dedent = require('dedent')

module.exports = function(bp) {
  bp.middlewares.load()

  // Listen for the GET_STARTED postback on Facebook Messenger
  bp.hear({ text: 'GET_STARTED' }, (event, next) => {
    
    // Send a Welcome message (function is defined below)
    sayWelcome(bp, event)

    // If there is no conversation that exists for this user yet
    if (!bp.convo.find(event)) {
      // Start a new conversation (see function below)
      askConfirmProfile(bp, event)
    }
  })

}

function sayWelcome(bp, event) {
  // sendText returns a NodeJS Promise (https://www.promisejs.org/)
  return bp.messenger.sendText(event.user.id, `Hello ${event.user.first_name} !`)
  .then(() => bp.messenger.sendText(event.user.id, 'This is a demo of asking questions on messenger.'))
}

function askConfirmProfile(bp, event) {

  const txt = message => bp.messenger.createText(event.user.id, message, { typing: true })

  bp.convo.start(event, convo => {

    const getProfile = () => ({
      fname: convo.get('fname') || event.user.first_name,
      lname: convo.get('lname') || event.user.last_name,
      gender: convo.get('gender') || event.user.gender
    })

    const profileTxt = profile =>
    txt(dedent`Here's the info I have on you:
         > First Name: ${profile.fname}
         > Last Name: ${profile.lname}
         > Gender: ${profile.gender}`)

    const isProfileCorrect = bp.messenger.createText(event.user.id, 'Is this correct ?', {
      quick_replies: [ 
        { title: 'No, fix it', payload: 'PROFILE_WRONG' },
        { title: 'Yes, perfect', payload: 'PROFILE_RIGHT' }
      ]
    })

    convo.messageTypes = [ 'text', 'message', 'postback', 'quick_reply' ]
    
    convo.threads['default'].addMessage(() => profileTxt(getProfile()))
    convo.threads['default'].addQuestion(isProfileCorrect, [
      {
        pattern: 'PROFILE_WRONG',
        callback: () => {
          convo.say(txt('I am sorry to hear that we got your profile wrong. We will fix that now.'))
          convo.switchTo('ask')
        }
      },
      {
        pattern: 'PROFILE_RIGHT',
        callback: () => {
          convo.stop('done')
        }
      },
      {
        default: true,
        callback: () => {
          convo.say(txt('Sorry I don\'t understand what you just said.'))
          convo.repeat()
        }
      }
    ])
    
    convo.createThread('ask')
    convo.threads['ask'].addQuestion(txt('What is your first name ?'), [{
      default: true,
      callback: res => {
        convo.set('fname', res.text)
        convo.next()
      }
    }])

    convo.threads['ask'].addQuestion(txt('What is your last name ?'), [{
      default: true,
      callback: res => {
        convo.set('lname', res.text)
        convo.next()
      }
    }])

    const askGender = bp.messenger.createText(event.user.id, 'What is your gender ?', { quick_replies: [
      { title: 'Guy', payload: 'QR_MALE' },
      { title: 'Girl', payload: 'QR_FEMALE' },
    ]})

    const genderUtterances = {
      male: /man|guy|QR_MALE/i,
      female: /girl|woman|QR_FEMALE/i
    }

    convo.threads['ask'].addQuestion(askGender, [
      {
        pattern: genderUtterances.female,
        callback: res => {
          convo.set('gender', 'female')
          convo.switchTo('default')
        }
      },
      {
        pattern: genderUtterances.male,
        callback: res => {
          convo.set('gender', 'male')
          convo.switchTo('default')
        }
      },
      {
        default: true,
        callback: res => {
          convo.say(txt('I don\'t understand this.'))
          convo.repeat()
      }
    }])

    convo.on('done', function() {
      convo.say('🎈')
      convo.say(txt("We're all done then :)"))
    })

  })
}

index_umm.js

/*
SPLIT CONTENT FROM THE FLOW, UPCOMING BOTPRESS v1
Description: This is an attempt at separating the content from the flow logic.
             This bot is the same as index.js and does the exact same thing.
             The content is logic-less, the flow is content-less.
             The goal is that non-developers can edit the content easily,
             remove the need to redeploy the app after changing the content,
             and also have a much more clean code-base.
Dependencies: Botpress UMM (next branch) || Unstable
              DEPENDS on the `content.yml` file, which is the actual content
*/

module.exports = function(bp) {
  bp.middlewares.load()

  // Listen for the GET_STARTED postback on Facebook Messenger
  bp.hear({ text: 'GET_STARTED' }, (event, next) => {
    
    // Send a Welcome message (function is defined below)
    event.reply('#welcome')

    // If there is no conversation that exists for this user yet
    if (!bp.convo.find(event)) {
      // Start a new conversation (see function below)
      askConfirmProfile(bp, event)
    }
  })
}

function askConfirmProfile(bp, event) {
  bp.convo.start(event, convo => {

    const getProfile = () => ({
      fname: convo.get('fname') || event.user.first_name,
      lname: convo.get('lname') || event.user.last_name,
      gender: convo.get('gender') || event.user.gender
    })

    convo.messageTypes = [ 'text', 'message', 'postback', 'quick_reply' ]

    setupDefaultThread(convo, event)
    setupAskThread(convo, event)

    convo.on('done', function() {
      convo.say('#done')
    })

  })
}

function setupDefaultThread(convo, event) {
  convo.threads['default'].addQuestion('#ask_profile_ok', getProfile, [
    {
      pattern: 'PROFILE_WRONG',
      callback: () => {
        convo.say('#profile_wrong')
        convo.switchTo('ask')
      }
    },
    {
      pattern: 'PROFILE_RIGHT',
      callback: () => {
        convo.stop('done')
      }
    },
    {
      default: true,
      callback: () => {
        convo.say('#misunderstand')
        convo.repeat()
      }
    }
  ])
}

function setupAskThread(convo, event) {
  
  const genderUtterances = {
    male: /man|guy|QR_MALE/i,
    female: /girl|woman|QR_FEMALE/i
  }

  convo.createThread('ask')

  convo.threads['ask'].addQuestion('#ask_first_name', [{
    default: true,
    callback: res => {
      convo.set('fname', res.text)
      convo.next()
    }
  }])

  convo.threads['ask'].addQuestion('#ask_last_name', [{
    default: true,
    callback: res => {
      convo.set('lname', res.text)
      convo.next()
    }
  }])

  convo.threads['ask'].addQuestion('#ask_gender', [
    {
      pattern: genderUtterances.female,
      callback: res => {
        convo.set('gender', 'female')
        convo.switchTo('default')
      }
    },
    {
      pattern: genderUtterances.male,
      callback: res => {
        convo.set('gender', 'male')
        convo.switchTo('default')
      }
    },
    {
      default: true,
      callback: res => {
        convo.say('#misunderstand')
        convo.repeat()
      }
    }
  ])
}

@slvnperron yeah I like it, just not sure about how we trigger it :)