You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Gregory Brown. Can you please help me in booking a flight ticket from JFK to LAS? Sure, my trip dates are from 12/14 to 12/16.

ASSISTANT: Sorry, there is no plane on your requested travelling dates.

USER: It's ok, thank you.

ASSISTANT: My pleaure.