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: I am William Robinson. Can you help me in ticket booking from DFW to DEN? 
 agent: Sure, can you please specify me your dates of travel? 
 customer: My travelling dates are from 11/13 to 11/15. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: There is a connecting flight 1003 o Spirit airlines, shall I proceed? 
 customer: Please proceed. 
 agent: Your booking is done. 
 customer: Thank you.
A:
book