Given the task definition and input, reply with output. 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

customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: Can you please help me to book flight ticket from JFK to LAX? 
 agent: Sure, may I know your travel dates please? 
 customer: My trip dates are July 18 and July 20. 
 agent: Can you please share your name? 
 customer: I would prefer connecting flight. 
 agent: On whose name you want me to book a flight ticket? 
 customer: Sorry, I am Gary Walker. 
 agent: Do you have any other specifications? 
 customer: No, thank you for asking. 
 agent: American airlines is providing connecting flight for you with the fare of 100 in economy class, shall I proceed with the booking? 
 customer: Yes, you can proceed. 
 agent: Your ticket is booked with the flight-1009. 
 customer: Thank you. 
 agent: Thank you for choosing us.
book