You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Betty Robinson. I would like to travel from AUS to SFO.

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

USER: My preferable dates are from 07/20 to 07/22.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you, have a good day.