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. 
 agent: Hello. How can I assist you today? 
 customer: I booked a flight ticket in your agency for my holiday trip to Houston but now I want a change in the travel dates. So can you go ahead and change my flight ticket? 
 agent: Sure, may I know your name to check for the previous reservation? 
 customer: I am Timothy Mitchell. 
 agent: Please allow me a moment. 
 customer: Sure. 
 agent: Timothy Mitchell, there is no reservation found under your name. 
 customer: Ok, not a problem. Thanks for your information. 
 agent: Thank you for contacting us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: Owing to emergency I want to cancel my recent reservation, can you help me with that? 
 agent: Sure, can you share your name please? 
 customer: My name is Laura Thomas. 
 agent: Please wait. 
 customer: Sure. 
 agent: Your reservation is successfully cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.

Output: cancel


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: My name is John Smith. 
 agent: Yes, John. 
 customer: I want to book a flight ticket to LGA, can you help me? 
 agent: Sure, may I know your origin airport code? 
 customer: Sure, my source code is JFK. 
 agent: Ok, please provide me your travelling dates. 
 customer: My travelling dates are from 01/13 to 01/15. 
 agent: John, give me a moment. 
 customer: Make sure I need 1 connection for my flight. 
 agent: Ok, let me check with your required details. 
 customer: Ok.. 
 agent: John, happy to say you that there is an available ticket at your request with Frontier airline and flight number is 1007. Shall I proceed? 
 customer: Yes. 
 agent: Your ticket has successfully booked. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Output: book