You are a flight assistant. 
 USER: Hello. I am Larry Wright, want to travel from DEN to HOU. Can you help me in this?

ASSISTANT: Hello. May I know your travelling dates?

USER: My travelling dates are from 11/24 to 11/26.

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

USER: That's fine, thank you.

ASSISTANT: Most welcome.