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 can I help you today? 
 customer: Can you aid me in booking a flight ticket from LGA to CLT? 
 agent: Sure, may I know your planned trip dates? 
 customer: Sure, I would like to go on Oct 20th and return back on Oct 22nd. 
 agent: Do you have any connection limit? 
 customer: Ensure it is a single connecting flight. 
 agent: Is there any class preference? 
 customer: Ensure it is in the business class. 
 agent: May I know your arrival and depart timings? 
 customer: No, I don't have any specific timings. 
 agent: Do you have any other specifications? 
 customer: No, I don't have any other specifications. 
 agent: Please forward your name. 
 customer: Myself Ronald Brown. 
 agent: Sorry, there are no flights found on your specified routes. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for availing us. 
 customer: Welcome.
A:
no_flight