You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Kathleen Thompson. I want to travel from DCA to CLT.

ASSISTANT: May I know your preferable dates to travel?

USER: My preferable dates are from 11/17 to 11/19.

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

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.