const flights = [

  {id: 1, origin: 'New York', destination: 'Los Angeles', departureTime: '9:00am', price: 200},

  {id: 2, origin: 'Chicago', destination: 'Miami', departureTime: '11:30am', price: 175},

  {id: 3, origin: 'San Francisco', destination: 'Las Vegas', departureTime: '1:45pm', price: 150},

];

​

const botPrompts = [

  'Hi, welcome to Flight Booking. How can I assist you today?',

  'What is your origin city?',

  'What is your destination city?',

  'What is your departure date? (YYYY-MM-DD)',

  'How many passengers will be travelling?',

  'Here are the available flights:',

  'Which flight would you like to book? Please enter the ID of the flight.',

  'Great, your flight has been booked! Thank you for using Flight Booking.',

];

​

let currentPrompt = 0;

let originCity;

let destinationCity;

let departureDate;

let numPassengers;

let selectedFlight;

​

function getBotResponse(userInput) {

  let response;

  switch(currentPrompt) {

    case 0:

      response = botPrompts[currentPrompt];

      currentPrompt++;

      break;

    case 1:

      originCity = userInput;

      response = botPrompts[currentPrompt];

      currentPrompt++;

      break;

    case 2:

      destinationCity = userInput;

      response = botPrompts[currentPrompt];

      currentPrompt++;

      break;

    case 3:

      departureDate = userInput;

      response = botPrompts[currentPrompt];

      currentPrompt++;

      break;

    case 4:

      numPassengers = userInput;

      response = botPrompts[currentPrompt];

      currentPrompt++;

      break;

    case 5:

      response = botPrompts[currentPrompt] + '\n\n';

      flights.forEach(flight => {

        response += `ID: ${flight.id}, Origin: ${flight.origin}, Destination: ${flight.destination}, Departure Time: ${flight.departureTime}, Price: $${flight.price}\n`;

      });

      currentPrompt++;

      break;

    case 6:

      selectedFlight = flights.find(flight => flight.id === Number(userInput));

      if (selectedFlight) {

        response = botPrompts[currentPrompt];

        currentPrompt++;

      } else {

        response = 'Sorry, that is not a valid flight ID. Please try again.';

      }

      break;

    case 7:

      response = botPrompts[currentPrompt];

      currentPrompt = 0;

      break;

    default:

      response = 'Sorry, I didn\'t understand that. Please try again.';

  }

  return response;

}

​

// example usage

console.log(getBotResponse(''));

console.log(getBotResponse('New York'));

console.log(getBotResponse('Los Angeles

​