Q: 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. 
 agent: Hello, how may I be at your service today? 
 customer: Can you please help me to book a flight from AUS to MSP? 
 agent: Sure, can you please let me know your specific dates of travel? 
 customer: My travel dates are Nov 4th and 6th. 
 agent: Do you prefer any stopover in between journey? 
 customer: I prefer to fly in direct flight. 
 agent: Do you have any more specifications? 
 customer: No. 
 agent: Ok, please be on hold. 
 customer: Sure. 
 agent: Thank you for your time, we did not find any flights matching your credentials. 
 customer: No problem, thank you. 
 agent: For documentation purpose may I know your name please? 
 customer: My name is Laura Jackson. 
 agent: Ok, thank you for choosing us.
A:
no_flight