You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from AUS to IAD.

ASSISTANT: Can I have your journey dates?

USER: Journey dates are from Sept, 16 to Sept, 18.

ASSISTANT: Do you need any connection limit?

USER: I would prefer direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: May I know your name for documentation purpose?

USER: Robert Garcia.

ASSISTANT: Thank you for choosing us.