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. 
 agent: Hello, what can I aid you at this moment? 
 customer: Here John King. I need a flight from JFK to IAD to attend a live concert, can you please help me in flight ticket booking? 
 agent: I am here to help you about your flight ticket booking, can you please provide your scheduled dates of trip? 
 customer: My trip dates are 05/18 and 05/20. 
 agent: AA airline is providing a flight which costs 100 with a single connection limit. Would you like to book this flight? 
 customer: Sure, you can proceed with booking on my name which I have mentioned. 
 agent: I have booked your flight ticket with the flight 1006. 
 customer: Thank you for your help in my ticket booking. 
 agent: Most welcome, thank you for choosing our service. 
 customer: You are most welcome.
Output:
book