You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: George Garcia here.

ASSISTANT: Garcia, how may I render you today?

USER: As I'm new to Washington, I'm planning a round trip to visit some of the tourist places here. Can you please help me in booking the ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Sure, my departure and return dates are 02/10 and 02/12.

ASSISTANT: Ok, may I know your airport code please?

USER: As this is a round trip, both my source and destination airport codes are DCA itself.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight available for you.

USER: Sure, please search for the direct flights only.

ASSISTANT: Sorry Garcia, there are no direct flights available on your requested dates.

USER: Oh! That's ok, I'll find some other mode of transport to reach my destination. Thank you anyways.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.