You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I have planned to book a ticket from IAD to LGA, can you assist me in booking my ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: My preferred dates are Feb 27th and Feb 29th.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need connecting flight.

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

USER: Susan Hall.

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

USER: No problem, thank you for searching.

ASSISTANT: Thank you for opting us.