You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Anthony Hill. I want to book a flight ticket from IAD to AUS. Could you help me in booking?

ASSISTANT: Sure, I will help you in booking. May I know your journey dates please?

USER: My travelling dates are from Dec 20-22.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Please give me a moment.

USER: Ok, please check with direct flight.

ASSISTANT: Sorry there are no flight found with your given information.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.