Dialogflow webhook to transfer user to live agent

getInfo.js

function getInfo(contexts) {
  var product = contexts[contexts.length - 1]['parameters']['Product']
  var state = contexts[contexts.length - 1]['parameters']['geo-state-us']

  for (var i = 0; i < contexts.length; i++) {
    var context = contexts[i]['parameters']
    if (typeof context['Product'] != "undefined" && typeof context['geo-state-us'] != "undefined") {
      return context
    }
  }
  return null
}

webhook.js

app.post('/', function (req, res) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  res.header("Content-Type", "application/json");
  console.log("req.body", JSON.stringify(req.body, null, 2));

  var json = null
  if (intent == "transfer - ask name - ask product - ask state") {
    var contexts = req.body['queryResult']["outputContexts"]
    var data = getInfo(contexts)
    var text = "Great.  I’m going to hand you over to a Customer Service Representative now."
    var parameters = { "text": text }
    var json = {
      'followup_event_input': { name: 'transfer_event', 'language_code': 'en', "parameters": parameters },
      "outputContexts": [
        {
          "name": req.body.session+"/contexts/setCRMData",
          "parameters": data,
          "lifespanCount": 5
        }
      ] 
    }
    return res.json(json)
})