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
Q: customer: Hello. 
 agent: Hello, how may I assist you today? 
 customer: I am Kenneth Taylor. I want to travel from ATL to DEN. Can you help me in booking a flight ticket? 
 agent: When would you like to travel? 
 customer: I want to fly in the flight on Feb 10 and Feb 12. 
 agent: Is there any class preference for you? 
 customer: No, but I want to depart in morning time. 
 agent: We found a connecting flight with an airline Spirit of flight 1008 and cost is 600 in business class. Can I proceed with the booking? 
 customer: Proceed to booking. 
 agent: Your ticket has been booked with depart time 3:00 AM. 
 customer: Thank you for your help. 
 agent: Thank you.
A:
book