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, I am Joseph Green. 
 agent: Hello,. How can I help you? 
 customer: Can you please assist me in booking a flight ticket from WA-SEA to DTW? 
 agent: Sure. Let me know your travelling dates? 
 customer: My travelling dates are from Dec 6 to Dec 8. 
 agent: Sorry, no flights found for your travelling dates. 
 customer: That's not a problem,. Thank you. 
 agent: Thanks.
Output:
no_flight