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 Q]: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I made a reservation earlier to visit Phoenix in direct flight but now I want to travel in connecting flight. can you help me in changing my reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: I am Sandra Carter. 
 agent: Please, wait for a moment. 
 customer: Ok. 
 agent: Thank you for waiting, there is no reservation found on your name to proceed for modification. 
 customer: No issue. Thank you. 
 agent: Thank you for approaching us.
[EX A]: no_reservation

[EX Q]: customer: Hello. 
 agent: Hello, how may I assist you today? 
 customer: I want to change my existing reservation due to my board exams. Can you help me for that one/. 
 agent: Sure, I am here to help you. May I know your name please? 
 customer: Sure, my name is Nicolas Edwards. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Sorry to inform you that there is no active reservation found on your given name. 
 customer: No issues, thank you for the information. 
 agent: Thanks for contacting us.
[EX A]: no_reservation

[EX Q]: customer: Hello. 
 agent: Hello, how can I aid you? 
 customer: I have planned to visit DFW from JFK, please assist me in booking. 
 agent: Sure, can you share your trip dates? 
 customer: My preferred dates are Mar 10th and return Mar 12th. 
 agent: Do you have any preferences? 
 customer: Yes, I need economy class. 
 agent: May I know your name? 
 customer: Barbara Martinez. 
 agent: There is a connecting flight with number 1002 in airline Spirit, the fare is 100 in economy class. Can I book it? 
 customer: Proceed. 
 agent: Your ticket is reserved, the depart time is 23:00 hours and return time is 13:00 hours. 
 customer: Thank you for booking. 
 agent: Thank you for opting us.
[EX A]:
book