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: Hi. 
 agent: Hello, how can I assist you? 
 customer: Can you please book me a flight ticket from AUS to MSP? 
 agent: Sure, let me know your travelling dates. 
 customer: My travel dates are from Dec 20 to Dec 22. 
 agent: Please share your class preference. 
 customer: I would like to travel in an economy class. 
 agent: May I know your name? 
 customer: Myself Ronald Baker. 
 agent: Sorry, there are no flights found based on your details. 
 customer: That's ok, not a problem. Thanks for your help. 
 agent: Thank you for choosing us.
A:
no_flight