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
One example is below.
Q: 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.
A: no_reservation
Rationale: 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
Q: customer: Hello. 
 agent: Hello. 
 customer: Jonathan Lewis here. 
 agent: How may I guide you? 
 customer: Can you please help me in booking a flight ticket from HOU to IAD? 
 agent: Sure, I am gleeful to help you. Can you please provide me your trip dates? 
 customer: Sure, my travel dates are from 11/15 to 11/17. 
 agent: Please wait for a minute. 
 customer: Sure, I will wait for your response. 
 agent: There is a direct flight in AA airlines with the flight 1028 and price is 100. Shall I proceed? 
 customer: Ok, please proceed with booking. 
 agent: Ok, your ticket is booked successfully. 
 customer: Thank you for booking. 
 agent: Thank you for approaching us, have a nice day.
A:
book