Detailed Instructions: 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 Christopher Jones. 
 agent: Hello, how may I assist you? 
 customer: Can you book a ticket from SEA to MCO? 
 agent: Sure, may I know your journey dates please? 
 customer: I am planning to go by 07/01 and return back on 07/03. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
 customer: Make sure that connection limit is 1. 
 agent: I found a flight for you with JetBlue airline and it costs you 100. Shall I proceed? 
 customer: Yes, you can go ahead. 
 agent: Your ticket has been booked with 1007 flight number. 
 customer: Thank you. 
 agent: Welcome, thank you for choosing us. 
 customer: You are welcome.
A:
book