You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Carolyn Wilson, want to travel from CLT to DCA.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from 06/17 to 06/19.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Welcome.