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. 
 agent: Hello, how may I aid you? 
 customer: Can you  please book a flight ticket from SFO to DTW? 
 agent: May I know your trip dates? 
 customer: Thank you. I have  planned my travel  dates as Oct 31 and Nov 02. 
 agent: Is there any connection limit? 
 customer: I am looking for single connecting flight. 
 agent: Is there any other preferences? 
 customer: Yes, I would prefer economy class only to travel. 
 agent: Please help me with your name? 
 customer: Sure, myself Nicole Johnson. 
 agent: American Airlines providing connecting flight in the economy class with fare 100, shall I proceed for booking? 
 customer: That is fine,  please proceed with booking. 
 agent: Your ticket has been confirmed with flight number 1003. 
 customer: Thank you for your help. 
 agent: Thank you for opting us. 
 customer: Most welcome.
A:
book