You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Could you please book  a flight ticket from DCA to AUS?

ASSISTANT: Sure, we are happy to help you. Can you please let me know your travelling dates?

USER: My travelling dates are Oct 16 and Oct 18.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I need a direct flight.

ASSISTANT: Are there any other specifications for you?

USER: No.

ASSISTANT: Can I have your good name?

USER: I am Stephanie Walker.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.