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: Hello. 
 agent: Hello. 
 customer: I am David Parker. 
 agent: How can I assist you for the day? 
 customer: I am planning to visit New York, can you please book me the ticket from OAK to JFK? 
 agent:  Sure, I am here to help you with that flight ticket booking. May I know your  preferable travel dates, please? 
 customer: My preferable journey dates are from 11/10 to 11/12. 
 agent: Sorry to tell you that, there are no flights available as per your given travel dates. 
 customer: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information. 
 agent: You are welcome, thank you for approaching us.
[EX A]: no_flight

[EX Q]: customer: Hello,. 
 agent: Hello. 
 customer: I am Larry Turner. 
 agent: How may I address you today? 
 customer: As, there is a food festival is going to be held in Charlotte, CLT so, I want to my food stall in that festival. So, I need your assistance in booking my flight ticket from Boston, BOS. 
 agent: Sure, is there any connection preference? 
 customer: I am comfortable to travel in any flight. 
 agent: Can I know your preferable travelling dates? 
 customer: My schedule dates are 03/24 - 03/26. 
 agent: Please wait a moment I will check and revert to you. 
 customer: Sure. 
 agent: We found a Delta airline matching your details with the connecting flight and the price 200. 
 customer: You can proceed with my booking. 
 agent: Your booking has been confirmed. 
 customer: Thank you for kind service. 
 agent: Thanks for choosing us.
[EX A]: book

[EX Q]: customer: Hi, I am Mary Lee. 
 agent: Hello, how can I assist you? 
 customer: I would like to change my existing reservation because, my business meeting was postponed. Will you help me in this? 
 agent: Sure. Please wait for a while. 
 customer: Thank you. Ok. 
 agent: Thanks for waiting, there is no reservation found on your name. 
 customer: Ok. Thank you. 
 agent: Thank you.
[EX A]:
no_reservation