Instructions: 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 assist you? 
 customer: I am Donna Smith. I am plaqnning to visit a my cousin's home. Can you please me out from LGA To EWR? 
 agent: Yes, can you tell me your travelling dates? 
 customer: I am planning to travel on 02/22 and return back on 02/24. 
 agent: Give me a moment. 
 customer: Make sure my connection limit is 0. Sure. 
 agent: Sorry to inform you that there is no flight found on your requested criteria. 
 customer: That's fine. 
 agent: Thank you for reaching us. 
 customer: Thank you for your service.
Output:
no_flight