You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Richard Carter, can you please book me a plane ticket from DFW to AUS?

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

USER: Sure, my planned trip dates are from 10/23 to 10/25.

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

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

ASSISTANT: Thank you for reaching us. Have a good day.