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. 
 agent: Hello, how can I be your helping hand today? 
 customer: Can you please avail me a flight ticket with the name of Carolyn Jones? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: Can you please tell me your airport codes? 
 customer: My airport codes are from NY - EWR to TX - DFW. 
 agent: Ok, when you want to return from DFW? 
 customer: I would like to return on 08/22. 
 agent: Ok, kindly mention your start date of the journey? 
 customer: I want to start my journey on 08/20. 
 agent: Ok, please wait a minute. 
 customer: Sure. 
 agent: We found a Delta airline with a halt in between the journey. 
 customer: Please go ahead with the booking. 
 agent: Your ticket has been confirmed with flight number 1001 with fare of 100. 
 customer: Thank you. 
 agent: Thank you for contacting us.
Solution:
book