You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Samuel Parker, Will you please help me to book a flight ticket from Detroit, DTW on 09/12?

ASSISTANT: Sure, I am here to help you with that. Can I know your destination code and return date?

USER: My destination airport code is Charlotte, CLT. I want to return on 09/14.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.