You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what services are you seeking from us?

USER: Can you please help me to book a flight from LGA to DCA?

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, I want to travel on Dec 9 and need to return on Dec 11.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

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

USER: Myself Dorothy Allen.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I do not have any other preferences.

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

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for opting us.