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 help you? 
 customer: Can you please book a ticket from ATL to DEN to attend for a live concert? 
 agent: Can you mention your trip dates? 
 customer: My travelling dates are Feb 14 and Feb 16. 
 agent: Do you need any connections? 
 customer: I want single connected flight. 
 agent: Are there any other preferences? 
 customer: No. 
 agent: May I know your name? 
 customer: Sure, I am Brandon Evans. 
 agent: Connecting flight number 1007 with price 100 in economy class is available. Is it ok for you? 
 customer: Ok, please proceed. 
 agent: Your ticket has been booked. 
 customer: Thank you. 
 agent: Thank you for reaching us.
A:
book