You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Laura Taylor. I am planning to book a ticket from AUS to IAD. Can you please help me out?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I am planning to travel on Dec 09 and return back on Dec 11.

ASSISTANT: Thank you, do you have any limits on number of connections?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Do you have any another preferences on your journey?

USER: My depart time should be afternoon.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: That's fine, thank you for your service.

ASSISTANT: Welcome, thank you for reaching us.