You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Brandon Allen. I am planning to attend music concert at ATL, can you please help me with booking a flight ticket from DEN?

ASSISTANT: Can I know your travel dates?

USER: Sure, I would like to take off on 07/04 and return back on 07/06.

ASSISTANT: Allen, there is no flight available on your requested dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.