Plain & simple usage
{{Unreviewednote-NPF|article|unreviewer|note}}

{{Unreviewednote-NPF}}

Hi, I'm article. I wanted to let you know that I saw the page you reviewed or created, unreviewer, and have marked it as unreviewed. I also have the following comment:

note

If you have any questions, please ask them on my talk page. Thank you.

(Message delivered via the Page Curation tool, on behalf of the reviewer.)

{{Unreviewednote-NPF/sandbox}}

Thanks for reviewing article, Unreviewednote-NPF.

Unfortunately unreviewer has just gone over this page again and unreviewed it. Their note is:

note

To reply, leave a comment on this talk page, pinging the reviewer with {{u|unreviewer}}, and signing your reply with ~~~~ in the same edit, or comment on unreviewer's talk page.