I am not especially smooth. I just got tired of thinking of the right thing to say after the moment passed. This started as my own little cheat sheet. I am sharing it because a few friends asked for it and it seemed to help.
A few examples from the list. These are meant to sound like something a normal person would actually send.
This is how I use the list for myself. Pick a situation and a tone, then grab a few options.
I keep the rest of the list private mostly so it does not get copied everywhere and turned into spam. If you want it, it is $7. That mostly covers the time to keep it updated and organized.
PayPal will take you through checkout and then send you back to a private thank you page.
If you do not get redirected back, check your PayPal receipt email for the return link.