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, 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.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello, how may I abet you? 
 customer: Catherine Hall here, please cancel my reservation which I have done previously. 
 agent: Sure, may I know your good name? Thank you for providing your name, please hold on. 
 customer: Sure, I will wait for your response. 
 agent: No reservation found on your name. 
 customer: It's ok, thanks for your information. 
 agent: Thank you for choosing us, have a nice day.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: Can you please search a flight ticket from AUS to LGA? 
 agent: Sure, may I know your travel dates please? 
 customer: Ok, my travelling dates are 10/25 and 10/27. 
 agent: Thanks for your patience. I have found Delta airlines which flies with one connection. May I know your name please? 
 customer: Ok, myself Kimberly Carter. Please confirm my flight ticket. 
 agent: Thank you Kimberly. Sure your flight ticket has been confirmed now. 
 customer: Ok, fine thank you for your help. 
 agent: Thank you.
Example Output:
book