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. 
 agent: Hello, do you need any help from us? 
 customer: Michael Gonzalez here. Can you help me to book a flight ticket from DEN to SFO? 
 agent: Sure, could you please share your departure and arrival day? 
 customer: My travelling dates are 06 Feb and 08 Feb. 
 agent: The AA airline with flight number 1011 is available having fare as 100 and connection as 1, is it ok for you? 
 customer: Ok, proceed with the booking. 
 agent: Ok, your reservation is confirmed. 
 customer: Thanks for helping me. 
 agent: Thank you for choosing us, have a great day.
Solution:
book