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 Anthony White. 
 agent: Hello, what can I do for you? 
 customer: I would like to book a flight ticket to  Atlanta, GA-ATL to meet my grand parents on 05/10. Can you help me with this? 
 agent: Sure, may I know your source airport code? 
 customer: My boarding point is Las Vegas, NV-LAS. 
 agent: When did you plan to return? 
 customer: I intend to return on 05/12. The connection limit should be one. 
 agent: Sure. Please wait a moment. 
 customer: Ok. 
 agent: There is a Frontier airline with flight number 1029 and price is 100 available with your requirements. 
 customer: Ok, you can book the ticket. 
 agent: Your reservation is done. 
 customer: Thanks for your assistance. 
 agent: Thank you for opting us.
Solution:
book