You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Kathleen Turner, want to book my round trip ticket from HOU. Please help me.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are from  01/14 to 01/16.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

USER: That's fine, thank you.

ASSISTANT: You are welcome.