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
--------
Question: customer: Hello, my name is David Thompson. 
 agent: Hello David,. How can I help you now? 
 customer: Due to sudden change in weather where I wanted to visit, I need to cancel the ticket. 
 agent: Ok sure, please wait a moment. Thank you for waiting. Sorry David, no reservation is found under your name. Thank you for choosing us. 
 customer: Ok that's fine, thank you for giving a instantaneous response. 
 agent: You are welcome, have a good day.

Answer: no_reservation


Question: customer: Hi. 
 agent: Hello. 
 customer: I am Matthew Green. 
 agent: How can I help you now? 
 customer: Please search flights on these routes LAX to JFK? 
 agent: Sure, can you please mention the travelling dates of your journey? 
 customer: I am going to start my journey on 05/01 and I would like to return on 05/03. 
 agent: Ok, please wait for a while. 
 customer: OK. 
 agent: Thank you for waiting, there is a flight 1001 in Delta airline has the price 100 with 1 connection. Can I proceed with this booking? 
 customer: Ok proceed to booking. 
 agent: Your booking is done, have a safe journey. 
 customer: Thank you for booking. 
 agent: Thank you for approaching us, have a nice day.

Answer: book


Question: customer: Hello. 
 agent: Hello, welcome to flight ticket booking agency. 
 customer: Thank you. 
 agent: How may I help you? 
 customer: Can you help me in booking a flight ticket from JFK to DCA? 
 agent: Sure, I can reserve a flight ticket for you. Can I know your respective name please? 
 customer: I am George Carter. 
 agent: Ok, when do you want to depart from JFK and return back from DCA? 
 customer: I want to travel on 10/23, and return on 10/25. 
 agent: Ok, please let me know the connection limit preference. 
 customer: I need a connecting flight. 
 agent: There is an economy class flight in this route. Is that ok for you? 
 customer: Yes. 
 agent: If you have any other requirements that should met, please tell me? 
 customer: No. 
 agent: Ok, the flight is available in the JetBlue airlines which is departing and returning in the afternoon time and the flight ticket cost is 100. Shall I reserve the ticket? 
 customer: Proceed with the booking. 
 agent: I have confirmed your flight ticket with the service number 1008. Have  a nice and happy journey. 
 customer: Thanks for the assistance. 
 agent: That's my pleasure to assist you. Thank you for contacting us.

Answer:
book