You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Kenneth Taylor.I need to book a flight ticket.

ASSISTANT: Sure, I am here to book a ticket for you.

USER: My journey dates are departure date is Feb/10 arrival date is Feb/12. I am travel from CA-LAX to NV-LAS.

ASSISTANT: Sure, Wait a moment I will check and let you know.

USER: OK.

ASSISTANT: Thank you for waiting, Sorry there are no flights matching your criteria. Thank you for reaching us, Have a nice day.

USER:  OK.Thanks for your information.