You will be given a definition of a task first, then some input of the task.
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

customer: Hello, I am Debra Perez. 
 agent: Hello, how can I be a helping hand to you? 
 customer: I am exhibiting my art gallery in Frick Collection at New York, can you please be my helping hand in reserving a flight ticket? 
 agent: Sure, do you have any connection limit? 
 customer: Yes, I want a single connection. And price should not exceed 5000. 
 agent: Please provide your preferred journey dates? 
 customer: I want to fly on 04/21 and return on 04/23. 
 agent: To proceed for booking can I know your airport codes? 
 customer: My destination airport code is NY-LGA and source is TX-DFW. 
 agent: Please wait for a while, I will check and get back to you? 
 customer: Ok. 
 agent: We found a flight 1202 with fare 600 matching with your essentials. Airline Hawaiian with single connection. 
 customer: Please book a ticket for this airline. 
 agent: Ok, your ticket has been reserved. 
 customer: Thank you for your help. 
 agent: Thank you for contacting us, have a safe journey.
Output:
book