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. Dennis Hall here. 
 agent: Hello. How can I help you? 
 customer: Reserve a flight ticket that is from SEA to CLT. 
 agent: Can you please tell your travelling dates? 
 customer: My travel dates are from 03/18 to 03/20. 
 agent: Sorry, there are no flights available with your requested details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you and have a nice day.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how may I render you today? 
 customer: I need your help to book a flight from IAD to DCA. 
 agent: Sure, we are here to help you. Please let me know your connection limit? 
 customer: Thank you. I am looking for a flight with single connection. 
 agent: May I know your good name? 
 customer: Myself Sarah Hall. 
 agent: Could you please share your journey dates? 
 customer: Sure, I want to travel on Apr 26 and need to return on Apr 28. 
 agent: Are there any more specifications? 
 customer: My depart time must be in the evening. 
 agent: We found a connecting flight 1007 from Hawaiian airline has fare 100 and departure time is 2:00 hours. 
 customer: Ok, please proceed. 
 agent: Your booking has been processed. 
 customer: Thank you. 
 agent: Thank you for choosing us.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello, how may I best oblige you today? 
 customer: Due to relocation of my fashion show computation, I need to change my existing reservation. Can you aid me to change my recent reservation? 
 agent: Sure, we are ecstatic to help you. 
 customer: Thank you. 
 agent: Can I have your name to trace your details? 
 customer: Sure, you can trace my status on the name of Katherine Baker. 
 agent: Please wait for a moment, I will check the reservation list and notify you. 
 customer: Sure. 
 agent: Thank you for waiting, we are sorry to say that no reservation was found based on your name. 
 customer: That's Ok, thanks for your information. 
 agent: Thank you for choosing us.

Ex Output:
no_reservation