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

Example input: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Example output: no_reservation
Example explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation
Q: customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: I am planning to attend my college fest from DCA to DFW. Can you make a reservation for me? 
 agent: Ok, I will help you with that. May I know the travel dates to book? 
 customer: Sure, my itinerary dates are on 03/16 and back on 03/18. 
 agent: Ok, there is a flight with 1 connection limit and the airfare is 300. Can I book? 
 customer: Yes, you can proceed with the booking. 
 agent: May I know your name to book? 
 customer: Yes, I am Joseph Harris. 
 agent: Thank you for providing your travel details, the flight is been booked. 
 customer: Thank you for your service. 
 agent: The airlines is JetBlue and the flight is 1025. Thank you for choosing our agency.
A:
book