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
Q: customer: Hello. 
 agent: Hello. How can I aid you today? 
 customer: I have to meet my project manager at New York, can you please help me to book my flight ticket from DCA to LGA? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: Sure, I will depart on July 20 and return on July 22. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
 customer: Sure. 
 agent: I found a flight for you with Hawaiian airline and it costs you 100. Shall I proceed? 
 customer: Yes, you can proceed for booking the ticket. 
 agent: On whose name you would like to book this ticket? 
 customer: Book the ticket in the name of Kevin Davis. 
 agent: Your ticket has been booked with 1006 flight number Kevin. 
 customer: Thank you very much for your help. 
 agent: Welcome, thank you for choosing us. Have a safe flight.
A:
book