parameter_types.rb

# features/support/parameter_types.rb
suffix = '(?:st|nd|rd|th)'

ParameterType(
  name: 'flight',
  regexp: /(\d+)#{suffix} flight/,
  transformer: ->(n) { n.to_i }
)

ParameterType(
  name: 'hotel',
  regexp: /(\d+)#{suffix} hotel/,
  transformer: ->(n) { n.to_i }
)

travel.feature

# features/travel.feature
Feature: Travel
  Scenario Outline: optional-flight & optional-hotel
    Given <query>

    Examples:
      | query                                        |
      | I reach StageFour: 3rd flight-2nd hotel test |
      | I reach StageFour: 3rd hotel test            |
      | I reach StageFour: 17th flight test          |
      | I reach StageFive: 2nd flight-1st hotel test |
      | I reach StageFive: 44th hotel test           |
      | I reach StageFive: 11th flight test          |

travel_steps.rb

# featrures/step_definitions/travel_steps.rb
Given('I reach StageFour:/StageFive: {flight}-{hotel} test') do |flight_number, hotel_number|
  flight_and_hotel(flight_number, hotel_number)
end

Given('I reach StageFour:/StageFive: {flight} test') do |flight_number|
  flight_and_hotel(flight_number, nil)
end

Given('I reach StageFour:/StageFive: {hotel} test') do |hotel_number|
  flight_and_hotel(nil, hotel_number)
end

module TravelWorld
  def flight_and_hotel(flight, hotel)
    puts "Flight #{flight} - Hotel #{hotel}"
  end
end

World(TravelWorld)