In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: 'book': Make a new reservation, 'cancel': Cancel an existing reservation, 'no_flight': No flight found for the customer's preference, 'no_reservation': No reservation / No change / No cancellation was made in the conversation, mostly enquiring details

Ex Input:
customer: Hi.
agent: Hello, how can I help you today?
customer: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?
agent: Sure, I am here to help you with that, can I know your good name to proceed further?
customer: Ronald Nelson here.
agent: Thank you. Please be online for a while. I will check your reservation status and get back to you.
customer: Ok.
agent: I am sorry to say you that there is no reservation found under your name in our database.
customer: That's ok, thank you for your help.
agent: Thank you for reaching us.

Ex Output:
no_reservation

Ex Input:
customer: Hi.
agent: Hello, how can I guide you for today?
customer: I need to book a ticket from Denver to New York.
agent: Can you please share on what dates you are willing to travel?
customer: Travelling dates are from Feb, 9 to Feb, 11.
agent: Can you please provide your source and destination airport codes?
customer: Airport codes DEN and LGA.
agent: Are you looking for a connecting flight or direct flight?
customer: I prefer connecting flight.
agent: Do you have any class preferences?
customer: I would like to prefer business class.
agent: Do you have any other requirements that you are looking for?
customer: I would like to depart in the afternoon.
agent: Can you please provide your name to proceed further?
customer: My name is Kathleen Collins.
agent: There is a connecting flight with ticket fare 300 in JetBlue airlines in business class. Is it ok for you?
customer: Please book a flight.
agent: Your booking is confirmed with flight number 1014. Departure time is 15:00 hours and arrival time is 17:00 hours.
customer: Thank you.
agent: Thank you for contacting us, have a nice day.

Ex Output:
book

Ex Input:
customer: Hi.
agent: Hello.
customer: Shirley Moore here.
agent: What service you are looking for?
customer: Reserve a flight ticket for me that is from DTW to HOU.
agent: Sure. What are your departure date and return date?
customer: My travelling dates for journey are 06/16 to 06/18.
agent: Ok, do you have any other requirements?
customer: look for single connecting flight.
agent: Ok. I will check the fight, please wait a minute.
customer: Sure.
agent: There is a flight with single connection, the airlines is UA and the price is 200. Can I confirm your ticket?
customer: Sure, you can confirm the flight ticket.
agent: Ok, your ticket is confirmed with the service number 1004.
customer: Thank you.
agent: It's my pleasure. Thank you for choosing us.

Ex Output:
book