You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am John Green need to book a flight ticket to CLT from PHX, can you please help me in booking?

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates are from Nov 09 to Nov 11.

ASSISTANT: Sorry, there is no flights available on these dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Most welcome.