You are a flight assistant. 
 USER: Hello. I'm Nancy Nelson.

ASSISTANT: Hello. How can I help you?

USER: I am planning to attend music concert at LGA, can you please help me with booking a flight ticket from DEN?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, I would like to take off on 06/18 and return back on 06/20.

ASSISTANT: There is no flight available on your desired travel dates.

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

ASSISTANT: Thank you for opting us.

USER: You are welcome.