You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me with booking a flight ticket from IAD to LGA?

ASSISTANT: Sure, can I know your good name please?

USER: Margaret Jackson here.

ASSISTANT:  When you are willing to travel?

USER: My travelling dates are from Dec 17-19.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer to fly in connected flight.

ASSISTANT:  Is there any other specifications?

USER: My depart has to be in afternoon.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.