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. Could you please let me know what help do you need? 
 customer: I want to fly from DCA to JFK. Can you check the flight availability on that route? 
 agent: Sure, I am happy to help you with that. Can I know your travel dates? 
 customer: Sure, my travel dates are 07/27 and 07/29. 
 agent: Ok, please share your preference about the connection limit. 
 customer: I want a flight with single connection. 
 agent: Ok, please tell me your other specifications. 
 customer: No more, thank you. 
 agent: On which name do you want me to reserve the ticket? 
 customer: Sure, Samuel Johnson  name only. 
 agent: The Southwest airlines is providing the service in this route which is having a single connecting flight with the ticket fare of 100. Shall I reserve a flight ticket in an economy class? 
 customer: Yes, you can proceed with that booking. 
 agent: I have booked your ticket with the flight-1009 and this flight departs at 18:00 hours and returns at 09:00 hours. Have a nice journey. 
 customer: Thank you for the booking. 
 agent: Thank you for choosing our agency.
A:
book