'It's is the first time I use this company and I have to tell you service was extraordinary. Thank you from the bottom of my heart it meant a lot to me that the arrangement get delivered on time.'
'Ordering was easy. Thank you.'
'The arrangement was beautiful. They were loved by all. Thank you very 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.