You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Mark Jones.

ASSISTANT: How may I help you?

USER: 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 01/31 and return back on 02/02.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Most welcome.