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 DEN to MSP? 
 agent: Sure, may I know your name? 
 customer: I am Nicole Parker. 
 agent: Thank you. Could you please tell me your travel dates? 
 customer: My travelling dates are Dec 4 and Dec 6. 
 agent: Noted. Do you prefer for a connecting flight or a direct flight? 
 customer: I want single connected flight. 
 agent: Noted. May I know your departure and arrival timings? 
 customer: I am comfortable with any time. 
 agent: Noted. Do you have any class preference? 
 customer: No. 
 agent: Ok, please wait for a while. Let me check. 
 customer: Sure. 
 agent: There is a flight having single connection with AA Airlines and the ticket fare is 100 only in business class. Flight will take-off at 14:00 hours and arrives at 19:00 hours. Shall I book the ticket for you? 
 customer: Ok, please proceed. 
 agent: Your ticket is booked with the flight-1009. 
 customer: Thank you. 
 agent: You are welcome and have a nice day.
A:
book