You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am looking for a flight from ATL to DCA, can you please help me in booking?

ASSISTANT: Sure, help me with the trip dates?

USER: My travelling dates are Aug 18 and Aug 20.

ASSISTANT: Do you have any class preference?

USER: I prefer business class flight.

ASSISTANT: Let me know your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Justin Evans.

ASSISTANT: Sorry, no flights were available at this moment.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.