You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to book a flight ticket to DC to visit Central Park on 12/11 and my return date will be on 12/13, can you please help me in booking?

ASSISTANT: Sure, please share me your trip dates.

USER: I have already mentioned above.

ASSISTANT: May I know your airport codes?

USER: My boarding and landing airport codes are LAX and IAD.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am comfortable with any kind of flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Daniel Miller.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.