You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Frank Scott, want to travel from DEN to IAH. Can you help me in this?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 02/13 to 02/15.

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

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

ASSISTANT: Most welcome.