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

Example Input: customer: Hello. 
 agent: Hello, how may I assist you at this moment? 
 customer: I need to cancel my reservation as I need to stay back in own city, due to my house has collapsed by Floods. 
 agent: May I know your name to track your details? 
 customer: Sure, I am Patricia Roberts. 
 agent: Ok, please give me a minute. 
 customer: Sure. 
 agent: Thanks for your time, no reservation was found based on your name. 
 customer: Ok, Thank you for your service. 
 agent: Thank you for consulting us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Timothy Martin. 
 agent: How may I help you? 
 customer: I need to book a flight ticket from New York, NY-EWR to Boston, MA-BOS. 
 agent: Sure, help me with the travel dates? 
 customer: I want to travel on dates 10/16 and 10/18. 
 agent: We do not found any flights running in your preferred routes. 
 customer: No problem, thank you for your help. 
 agent: Thank you for opting us.
Example Output: no_flight

Example Input: customer: Hello, I am Edward Phillips. 
 agent: Hello, how can I assist you today? 
 customer: Can you please book a ticket from PHL to OAK? 
 agent: Sure, I'll help you in that. May I know your travel dates please? 
 customer: Sure, I would like to go on 10/02 and return back on 10/04. 
 agent: Ok, please be on hold. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: Frontier airlines is having a flight with travel charge of 200, shall I proceed for booking? 
 customer: Ok, please proceed for further. 
 agent: Your ticket has been booked with flight-1012, have a safe journey. 
 customer: Thank you for booking. 
 agent: Thank you for choosing us. 
 customer: Welcome.
Example Output:
book