'A last minute order (as in 15 min before the deadline, oops!) that was still delivered timely, and by all accounts, was very nice looking. I would use them again.'
'Thank you for your prompt service upon a short notice.'
'They love it. That you so much!!!!!'
You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.