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, may I know your name? 
 customer: I want to change my existing reservation which is with the name Brenda Smith as my Business meeting got postponed. 
 agent: Please wait for a moment, while I check. 
 customer: OK, sure. 
 agent: Thanks for waiting, sorry to inform there is no reservation found on your name. 
 customer: OK, that's fine. Thank you. 
 agent: Thank you to connecting with us, have a nice day.

Ex Output:
no_reservation


Ex Input:
customer: Hello, my name is Deborah Turner. 
 agent: Hello, how can I help you? 
 customer: Present my health condition is not good so I need to cancel my reservation. 
 agent: OK, please wait a moment, I will check the status and revert you. 
 customer: OK. 
 agent: Thanks for waiting, there is no reservation found on your name. 
 customer: Thanks for your information. 
 agent: Thanks for connecting us, have a good day.

Ex Output:
no_reservation


Ex Input:
customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: I am planning to visit a trip at New York, EWR. Could you please help me with booking a flight ticket from HOU? 
 agent: Sure, may I know your travel dates? 
 customer: My travel dates are Feb 04 and Feb 06. 
 agent: Please share me your name. 
 customer: Sure, myself Gregory Moore. 
 agent: Do you have any specifications? 
 customer: I would prefer not to fly a low-cost Airline. Please recheck with that, my return time should be in the afternoon. 
 agent: Sorry, there is no low cost airline at this moment. 
 customer: That's ok, no problem. Thank you for the information. 
 agent: Thank you.

Ex Output:
no_flight