'Thanks everything was great'
'Thank you so much for the beautiful flowers and fruit that you delivered for me today. You did an amazing job. I live in the USA and trying to get something delivered to my sweet daughter in Canada was a challenge however you came through with flying colors and so quickly. Thank you so much! I would highly recommend your company.'
'The arrangements I requested were lovely and much appreciated.'
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.