'Let's just say I will only use this company from here on out!'
'Ordered flowers last minute for a funeral in a different state from which I live in. I ordered the flowers at 11:44 am and they were delivered by 2pm. Couldn't ask for a faster delivery. Thank you so much for making sure my arrangement was there on time!!!'
'Service was outstanding and the flowers were just what I wanted and were beautiful. Thank you!'
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.