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. 
 customer: I am Jennifer Jackson. 
 agent: How may I aid you? 
 customer: I am planning to attend music concert at AUS, can you please help me with booking a flight ticket from PHL? 
 agent: Sure, I am here to help you in booking process. Could you please provide me your journey dates? 
 customer: Sure, I would like to take off on Sept 5 and return on Sept 7. 
 agent: May I know your connection limit? 
 customer: Yes, make sure that the connection limit is 1. 
 agent: Please wait for a moment. 
 customer: Sure, take your time. 
 agent: Based on your details, there is a flight with 1 connection in AA airlines and price is 100. Can I proceed? 
 customer: Yes, please proceed with the booking. 
 agent: Ok, your ticket is reserved with the flight 1025. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us. 
 customer: You are welcome.
A:
book