You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Scott Martin, want to travel from PHX to DCA. Please help me in booking my ticket.

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

USER: My travelling dates are from 09/23 to 09/25.

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

USER: It's ok, thank you fro your help.

ASSISTANT: Thank you for reaching us.