Detailed Instructions: 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
See one example below:
Problem: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Solution: no_reservation
Explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

Problem: customer: Hello, I am Richard Perez. 
 agent: Hello, how may I be your helping hand? 
 customer: I have an meeting at NV - LAS, with my company CEO. As per my company rules I need to travel only in a connecting flight. 
 agent: Sure, do you have any fare limit? 
 customer: My fare is 1000. 
 agent: Please specify your travelling dates? 
 customer: My travelling dates are from 05/15 to 05/17. 
 agent: Can you let me know your source code? 
 customer: My source code is SFO. 
 agent: Please hold on. 
 customer: OK. 
 agent: We found a direct flight in AA airline with flight number 1010. Shall I proceed with booking? 
 customer: You can proceed with booking. 
 agent: Your flight ticket has been reserved. 
 customer: Thank you for the help. 
 agent: Thank you for approaching us.
Solution:
book