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: Hi. 
 agent: Hello. How may I assist you? 
 customer: Owing to an emergency I had to request for this change reservation. 
 agent: Ok, I will help you with that. Can I have your name , please? 
 customer: My name is Anna Young. 
 agent: Hold on a moment. 
 customer: Sure. 
 agent: I am sorry, there is no reservation found on your name to change. 
 customer: Thank you. 
 agent: Thank you for availing us.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: Can you help me booking a flight ticket from DTW to AUS? 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: I will start on 05/08 and return on 05/10. 
 agent: Do you need break in between your journey? 
 customer: I need a direct flight. 
 agent: Please let me know if you have any other specifications. 
 customer: No. 
 agent: May I know your good name please? 
 customer: I am Richard Lopez. 
 agent: Sorry to inform you that there are no direct flights available for you on those dates. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us.

A: no_flight
****
Q: customer: Hello. 
 agent: Hello. How can I aid you today? 
 customer: My name is George Hill, I want to book a flight ticket from HOU to SEA, can you help me? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: My trip dates are Aug 09 and Aug 11. 
 agent: Ok, do you have any other specifications? 
 customer: My return time is afternoon. 
 agent: Ok, hold on for a moment. Let me check the best available flight for you. 
 customer: Sure, I need a connecting flight. 
 agent: Sorry George Hill, there are no flights available on your requested dates. 
 customer: Ok, no problem. Thank you. 
 agent: Welcome, thank you for choosing us. Have a great day.

A:
no_flight
****