Oh dear, we noticed that you cancelled your action!

Oh shucks, your request failed!
We are embarrassed.

Oh shucks, the page you wanted can't be found!
We are embarrassed.

Oh shucks, we ran into a problem!
We are embarrassed!

Yes! Your request succeeded.

Your request couldn't be processed at this time because we encountered a technical error.
It might be an oversight on our part and we'd be grateful if you brought this to our attention.

We've looked all over for the page you requested but can't find it!
It could either be a new page that hasn't been released, in which case we ask you to try again in a few days, or it might be an oversight on our part and we'd be grateful if you brought this to our attention.

There are many reasons why we encounter difficulties so please try this action again.
If the condition persists, we'd be grateful if you brought this to our attention.