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 may I oblige you today? 
 customer: I am planning to travel from AUS to EWR, can you please help me in flight booking? 
 agent: Sure, can you please let me know your travel dates? 
 customer: My departure day is Apr 22, return day is Apr 24. 
 agent: Do you have any specifications? 
 customer: I want business class flight ticket. 
 agent: To proceed further, may I know your name? 
 customer: My name is Jonathan Hill. 
 agent: Ok, please stay online. I will check with airlines and let you know the availability. 
 customer: Sure, I want a flight with one connection. 
 agent: Ok. Sorry, there were no flights found on your preferable travel dates. 
 customer: No problem, thank you. 
 agent: Thank you for approaching us.
A:
no_flight