'The flowers were beautiful, and delivered in a timely manner. Thank you so much for making this transaction go smoothly. I would definitely use this flower shop again.'
'Thank you so much for the outstanding service! This my new favorite method of ordering flowers!!! You have a new loyal customer in me!!!'
'Very impressive. We love your responsiveness and information. They flowers were very nice and appreciated.'
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.