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, do you need any help from us? 
 customer: Michael Gonzalez here. Can you help me to book a flight ticket from DEN to SFO? 
 agent: Sure, could you please share your departure and arrival day? 
 customer: My travelling dates are 06 Feb and 08 Feb. 
 agent: The AA airline with flight number 1011 is available having fare as 100 and connection as 1, is it ok for you? 
 customer: Ok, proceed with the booking. 
 agent: Ok, your reservation is confirmed. 
 customer: Thanks for helping me. 
 agent: Thank you for choosing us, have a great day.
A:
book