You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to attend a Snooker's competition in Phoenix PHX from LAX. Can you find a flight ticket for me?

ASSISTANT: Sure, may I know your trip dates please?

USER: Ok, my planned trip dates are on Feb 23 and return on Feb 25.

ASSISTANT: Do you have any other requirements?

USER: Ok, I want an economy class.

ASSISTANT: Can I know your name?

USER: Yes, I am Jerry White.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Most welcome.