You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Paul Walker. I have to attend an interview in QA software solutions at Charlotte, can you please help me to book a flight ticket from DTW to CLT?

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

USER: Sure, my journey dates are June 22 and June 24.

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

USER: That's ok, thank you for your information.

ASSISTANT: Most welcome.