'Saw the flowers your store sent, it is very pretty.'
'Website was easy navigate and loved the option of letting you guys design whatever you wanted instead of something pictured. Thanks for getting it there in time with only 1 day notice.'
'Ordered online on a Saturday morning from and was delivered very quickly!'
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.