Detailed 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
Q: customer: Hello. 
 agent: Hello. How can I aid you today? 
 customer: I am looking to book a flight ticket from SEA to DEN. Can you help me for that? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: My travelling dates are Feb 27 and Feb 29. 
 agent: Ok, do you have any specifications? 
 customer: I prefer to book a direct flight in my journey. 
 agent: Ok, hold on for a moment. Let me check the best available flight for you. 
 customer: Sure, I will wait for your response. 
 agent: May I know your name please? 
 customer: My name is Justin King. 
 agent: Sorry Justin King, there are no flights available on your requested dates. 
 customer: That's ok, thank you for checking. 
 agent: Welcome, thank you for choosing us. Have a great day.
A:
no_flight