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. Could you please let me know what help do you need? 
 customer: I want to fly from DCA to JFK. Can you check the flight availability on that route? 
 agent: Sure, I am happy to help you with that. Can I know your travel dates? 
 customer: Sure, my travel dates are 07/27 and 07/29. 
 agent: Ok, please share your preference about the connection limit. 
 customer: I want a flight with single connection. 
 agent: Ok, please tell me your other specifications. 
 customer: No more, thank you. 
 agent: On which name do you want me to reserve the ticket? 
 customer: Sure, Samuel Johnson  name only. 
 agent: The Southwest airlines is providing the service in this route which is having a single connecting flight with the ticket fare of 100. Shall I reserve a flight ticket in an economy class? 
 customer: Yes, you can proceed with that booking. 
 agent: I have booked your ticket with the flight-1009 and this flight departs at 18:00 hours and returns at 09:00 hours. Have a nice journey. 
 customer: Thank you for the booking. 
 agent: Thank you for choosing our agency.
Solution:
book