You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I need to book a flight ticket from IAD to AUS, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I would like to travel on 11/24 to return on 11/26.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you. May I know your name please?

USER: Jessica Wilson here.

ASSISTANT: Sorry Jessica Wilson, there are no flights available on your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.