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, I am Michelle Thompson. 
 agent: Hello, how may I help you at this moment? 
 customer: I would like to visit Disney Land in San Francisco, so could you please book a ticket for me? 
 agent: Can I have your journey dates? 
 customer: Sure, I would like to go on 12/11 and return back on 12/13. 
 agent: May I know your nearby airport codes? 
 customer: My source and destination airport codes are LGA and SFO. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: There is a connecting flight available with Spirit airline, shall I book it? 
 customer: Ok, please proceed for further. 
 agent: Your booking is done with flight number 1009. Happy journey. 
 customer: Thank you for booking. 
 agent: Welcome. Thank you for opting us. 
 customer: Welcome.
A:
book