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

Input: Consider Input: customer: Hi, I am Kevin Williams. 
 agent: Hello, how may I aid you? 
 customer: I want to attend a business meeting at New York, NY-LGA, can you please book me a ticket from Washington, DC-DCA? 
 agent: Sure, may I know your travel dates? 
 customer: My travel dates are from 01/29 to 01/31. 
 agent: Do you have any specifications? 
 customer: My price limit is 500. I want a single connection in between my journey. 
 agent: OK, please wait a moment. 
 customer: Ok. 
 agent: Sorry, there were no flights found on your route. 
 customer: No problem, thanks for your information. 
 agent: Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: Hello, I am Michelle Thompson. 
 agent: Hello, how may I help you at this moment? 
 customer: I would like to visit Disney Land in San Francisco, so could you please book a ticket for me? 
 agent: Can I have your journey dates? 
 customer: Sure, I would like to go on 12/11 and return back on 12/13. 
 agent: May I know your nearby airport codes? 
 customer: My source and destination airport codes are LGA and SFO. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: There is a connecting flight available with Spirit airline, shall I book it? 
 customer: Ok, please proceed for further. 
 agent: Your booking is done with flight number 1009. Happy journey. 
 customer: Thank you for booking. 
 agent: Welcome. Thank you for opting us. 
 customer: Welcome.

Output: book


Input: Consider Input: customer: Hi, I am Jennifer White. 
 agent: Hello, How can I assist you today? 
 customer: I want a connecting flight to NV - LAS from NY - LGA. Can you please help me in booking a flight ticket? 
 agent: Sure, we are here to help you. Please provide your price limit. 
 customer: The price limit should not exceed 1000 with single connection. 
 agent: Sure, please provide your journey dates. 
 customer: My depart day will be on 12/29 and arrival day is on 12/31. 
 agent: Ok, please wait for a moment. 
 customer: Ok. 
 agent: Thank you for your patience, we are happy to say that there is a flight found with flight number 1029 and price is 100. The airline is AA. 
 customer: You can proceed with this airline. 
 agent: Sure, your ticket has been confirmed. 
 customer: Thanks for your information. 
 agent: Thank you for reaching us.
Output: book