Q: 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 planed a surprise meeting for my boy friend who stays in Atlanta. Would you please book a flight ticket from Washington, DC - IAD to Atlanta, GA - ATL for me? 
 agent: Hello, May I know your travelling dates? 
 customer: I would like to fly on 11/15 and recur on 11/17. And my name is Mary Taylor. 
 agent: Please wait a moment I will check and revert you. 
 customer: Sure. 
 agent: Yes, there is a flight found with your criteria. 
 customer: OK, thanks for your time. 
 agent: The details of flight is Air Line:UA, Flight number:1001 with price 100 and 1 connection. Shall I proceed with the booking? 
 customer: OK, I am happy with the flight details. Yes, you can proceed. 
 agent: Your flight is confirmed. 
 customer: Glad to hear you, thanks for your kind service. 
 agent: Thank you for contacting us.
A:
book