You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Shirley Parker. I want to book a flight ticket from SFO to LAX. Could you help me in booking?

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

USER: My travelling dates are from Oct 12-14.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.