You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Brian Clark. Can you please help me in booking a flight ticket from NY-EWR to FL-MCO?

ASSISTANT: Sure Brian Clark, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are from Jan 08 to Jan 10.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Sure.

ASSISTANT: Sorry Brian Clark, no flight is available to you on your dates due to some issues.

USER: Ok, That's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us, have a good day.