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. 
 customer: Myself Gregory Allen. 
 agent: My job is to assist you. May I know your concern please? 
 customer: Can you please book a flight ticket from EWR to LAS locations? 
 agent: Please let me know your travel dates to book? 
 customer: My travelling dates are from 04/20 and 04/22. 
 agent: There is a connecting flight with price 100. Can I book it now? 
 customer: Please proceed with it. 
 agent: Ok, there flight ticket is been booked and the flight number 1013. 
 customer: Thank you so much.
Solution:
book