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 Mary Jones. 
 agent: Hello, how can I assist you? 
 customer: I want to attend sports festival with festival in DCA, can you help me with reservation? 
 agent: Sure, may I know your source code? 
 customer: My source is MSP. 
 agent: Help me with the travelling dates? 
 customer: My depart is on 09/26 and return on 09/28. 
 agent: Please be on hold. 
 customer: OK. 
 agent: We have found a flight in an airline Delta with the flight number 1009. 
 customer: OK, proceed with booking. 
 agent: Your flight ticket has been booked. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.
Solution:
book