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: Hi. I am Michelle Thompson. 
 agent: Hello, how may I guide you today? 
 customer: I have to submit my research record at Houston university with my college friend from New York. Will you please help me in making an airline reservation? 
 agent: Sure, I will help you. Could you please provide me your airport codes? 
 customer: My source code is NY-EWR and destination code is TX-IAH. 
 agent: When you have planned to travel? 
 customer: My planned dates are 12/11 and 12/13. 
 agent: Kindly mention your fare limit? 
 customer: Fare limit is under 5000. 
 agent: We found a flight with Southwest airline and 1000 flight with fare 100 having a lay by. 
 customer: You can continue with booking. 
 agent: Your ticked has been confirmed. 
 customer: Thank you for your kind service. 
 agent: Thank you for picking us, have a great day.
Solution:
book