Definition: 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: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I have an urgent meeting in Orlando, FL - MCO. I want to go for a direct flight under price of 500. 
 agent: Sure, May I know your journey dates and source point? 
 customer: Can you help me to book? Ok, I want to start from New York, NY - EWR. My travel dates must be 09/19 and 09/21. 
 agent: Thank you for the details. Please wait a moment, I will check and let you know. 
 customer: Sure. 
 agent: Thank you for waiting, We did not find any flight based on your given details. 
 customer: Ok, no problem at all. 
 agent: Thank you for reaching us, Have a nice day ahead. 
 customer: Thanks for the information. 
 agent: May I know you name? 
 customer: Sure, I am Stephen Hill. 
 agent: Thank you.
Output:
no_flight