You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Stephanie Brown. i would like to travel from AUS to AUS, could you help me out?

ASSISTANT: May I know your desired travel dates please?

USER: My preferable dates are from 10/21 to 10/23.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.