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. 
 agent: Hello. How can I aid you? 
 customer: Stephanie Carter this side. I would like to book a flight ticket from PHL to CLT. 
 agent: Sure, can I know the travel dates please? 
 customer: Sure, I am planning to start my trip on 09/09 and fly back on 09/11. 
 agent: Ok, wait a moment please. 
 customer: Ok, please take your time. 
 agent: Thank you for waiting. There is a flight with number 1002 in JetBlue airline, can I proceed? 
 customer: Yes, please proceed if it has a single connection. 
 agent: I have booked the ticket in the name of Carter. 
 customer: Great! Thank you for the service. 
 agent: You are welcome, visit us again.
A:
book