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: Hello. 
 agent: Hello. How may I assist you today? 
 customer: Due to some problems my trip was cancelled so can you please cancel my flight ticket? 
 agent: Sure, may I know your name? 
 customer: Sure, my name is Edward Brown. 
 agent: Sorry, there is no active reservation on your name. 
 customer: Oh! It's ok, no problem. Thank you for your information. 
 agent: Thank you.

Ex Output:
no_reservation


Ex Input:
customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: Please book a flight ticket on a connecting flight. 
 agent: Sure, I am here to help you. Can you please share your airport codes? 
 customer: My airport codes are from OAK to LAS. 
 agent: On which dates you would like to travel? 
 customer: My trip dates are 09/22 and 09/24. 
 agent: May I know your departure and arrival time? 
 customer: I am comfortable with any timings. 
 agent: Do you have any other requirements? 
 customer: No, thanks for asking. 
 agent: Ok, please share your name. 
 customer: I am Thomas Scott. 
 agent: Sorry, there are no flights in this route as per your travelling details. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello. How can I assist you today? 
 customer: I have planned to go for Cultural festival at Detroit, DTW. Can you please help me for booking? 
 agent: Sure, I'm happy to help you in that. May I know your source airport code please? 
 customer: Sure, my source airport code is HOU. 
 agent: Can you please provide your planned travel dates? 
 customer: My travelling dates are Feb 11 and Feb 13. 
 agent: Can I have your good name please? 
 customer: Sure, I am Kevin Clark. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: Delta airlines is having a flight on that route with ticket fare of 100, shall I proceed for booking? 
 customer: Ok, please confirm. 
 agent: I have successfully booked your ticket with flight-1002, have a safe journey. 
 customer: Thank you. 
 agent: Thank you for choosing us.

Ex Output:
book