You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Justin White, want to travel from JFK to IAD.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from 03/29 to 03/31.

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

USER: That's fine, thank you for your time.

ASSISTANT: Most welcome.