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, I am Jeffrey Campbell. 
 agent: Hello, how may  I be at your service today? 
 customer: I want to book a direct flight to enjoy in Central Park at New York. Can you book a ticket on 07/20? 
 agent: Sure, May I know your return date please? 
 customer: Sure, I intend to return on 07/22. 
 agent: Can you please help me with your journey points with airport codes? 
 customer: Sure, my source is Austin, TX - AUS. The New York airport code is NY - JFK. 
 agent: Ok, please wait for  a while. 
 customer: Sure. 
 agent: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details. 
 customer: Ok, no issues. 
 agent: Thank you for reaching us. Have a nice day. 
 customer: Thank you for your service.
A:
no_flight