'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,'
'Thank you for your help. I live out-of-state and wanted to send flowers for my cousin's funeral.'
'Amazing job and thank you for getting the beautiful bouquet there on time.'
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.