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. How may I amend you today? 
 customer: I am David Miller. 
 agent: Ok. 
 customer: I have a desire to travel in ferry, so I am planning to travel in Staten Island Ferry in New York, EWR. 
 agent: Ok. 
 customer: Can you please make  a reservation with connected flight? 
 agent: Sure. Can you mention your travelling dates? 
 customer: My journey dates on 10/27 and 10/29. 
 agent: May I have your departure point? 
 customer: My boarding point is Dallas & Fort Worth, DFW. 
 agent: What is your price limit to travel? 
 customer: Price should be under 500. 
 agent: There is a plane Frontier which matches exactly to your request. Shall I proceed to book with flight 1002? 
 customer: Ok, proceed. 
 agent: Reservation has been confirmed. 
 customer: Thank you for your help. 
 agent: Thank you.
Solution:
book