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

customer: Hello, I ma Raymond Green. 
 agent: Hello, how may I assist you? 
 customer: Can you book a ticket from CLT to LAS? 
 agent: Sure, may I know your travel dates please? 
 customer: I am planning to start on 10/31 and return back on 11/02. 
 agent: Ok, hold on for a moment. 
 customer: I want direct flight. 
 agent: Sorry Green, there are no direct flights available on this route. 
 customer: No issues. Thank you for checking. 
 agent: Welcome, thank you for choosing us. 
 customer: You are welcome.
no_flight