You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: My friends and me are planning to visit to Zilker Park,in AUS. Please confirm a ticket on 09/25.

ASSISTANT: Sure, May I know your name?

USER: Gregory White is my name.

ASSISTANT: May I know your return date?

USER: We will back to home on 09/27.

ASSISTANT: Please help me with destination code.

USER: Austin airport code is AUS.

ASSISTANT: May I know the origin code?

USER: Origin is LAX.

ASSISTANT: Sorry, No flights found with your dates. Thank you, Have a nice day.

USER: Thank you for sharing information.