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 assist you at this moment? 
 customer: Please make a reservation with the name of Nicole Martin from PHX. 
 agent: Sure, I will assist you with that. Can you please mention your preferable travel dates? 
 customer: I want to travel on Dec 20 and return back on Dec 22. 
 agent: May I know your destination airport code name? 
 customer: Destination airport code is BOS. 
 agent: May I know your connection limit for this trip? 
 customer: I need a single connecting flight. 
 agent: Do you have any another specifications? 
 customer: I prefer to travel in economy class. 
 agent: Is there any additional preferences do you have? 
 customer: No. 
 agent: Ok, please hold on a moment. 
 customer: Sure. 
 agent: AA flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight? 
 customer: Yes, please confirm it. 
 agent: Your flight ticket is booked successfully, flight number is 1026. 
 customer: Thank you for the help. 
 agent: You are welcome Nicole Martin.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello, how can I help you? 
 customer: Owing to emergency I want to cancel my recent reservation, can you help me with that? 
 agent: Sure, can you share your name please? 
 customer: My name is Laura Thomas. 
 agent: Please wait. 
 customer: Sure. 
 agent: Your reservation is successfully cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.

Ex Output:
cancel


Ex Input:
customer: Hello. 
 agent: Hello, how may I support you? 
 customer: I want to cancel my reservation, due to the heavy rainfall from a couple of days. 
 agent: Sure, let me check the status and revert you. May I know your name? 
 customer: My name is Justin Garcia. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: We could not find any reservation on your name. 
 customer: That's ok. 
 agent: Thank you for opting us. 
 customer: Thanks for your kind information.

Ex Output:
no_reservation