You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

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

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

USER: I would like to travel on 09/04 to return on 09/06.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Can I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I need a return time in the evening.

ASSISTANT: May I know your name please?

USER: Janet King here.

ASSISTANT: Sorry Janet King , we haven't found any flights based on your specifications.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thanks for your information.