'Let's just say I will only use this company from here on out!'
'Thank you for delivering the flowers in a timely manner ! It was last minute ordering and was very easy to figure out . Thanks again for assistance in this manner,'
'My girlfriend said that she loved the flowers, that they were so beautiful. Thanks 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.