You are a flight assistant. 
 USER: Hello. My name is Michael Miller.

ASSISTANT: Hello, how may I assist you?

USER: I just need your help in booking a plane ticket from AUS to IAD.

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

USER: Sure, my planned journey dates are from 03/23 to 03/25.

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

USER: That's ok, thank you for the information.

ASSISTANT: You are most welcome.