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: Hi. 
 agent: Hello, how can I help you? 
 customer: I want to fly from PHL to JFK. Can you book a ticket from that route? 
 agent: Sure, may I know your planned travel dates? 
 customer: My planned travel dates are 08/15 and 08/17. 
 agent: May I know your connection limit? 
 customer: I want a flight with single connection. 
 agent: Do you have any other requirements? 
 customer: Make sure that, my depart time should be in the afternoon only. 
 agent: May I know your name please? 
 customer: Sure, Charles Edwards here. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: We found an UA airline, flight number: 1001, price: 100 with one connection. 
 customer: Yes, you can proceed with that booking. 
 agent: Your flight ticket has been reserved. 
 customer: Thank you for the booking. 
 agent: Thank you for choosing us.
A:
book