You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please help me in booking my flight ticket from DCA to LGA?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My trip dates are May 12 and  May 14.

ASSISTANT: Is there any connection limit for this trip?

USER: I need single connection flight.

ASSISTANT: May I know your arrival and depart timings?

USER: I need my return ticket at afternoon time.

ASSISTANT: Is there any class preference?

USER: I prefer business class ticket.

ASSISTANT: May I know your good name to proceed further?

USER: Myself Mark Roberts.

ASSISTANT: Please be on hold.

USER: Ok, sure.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.