For example this account has "please delete me" in user description and has been inactive for a while. Is there a way to remind an admin the owner of the account desires the account to be deleted?
It wouldn't help; the request to delete has to come directly from the user. This is a two-part process, changing the profile to "please delete me" (to prove ownership) and using the "contact us" form to request deletion. If the user didn't do the latter, the account won't be deleted no matter what the profile says.
(Well, unless it starts spamming or something, but I mean a regular account with worthwhile contributions.)
If you wanted to get the post deleted, you could try contacting the person through the forums, comments(not a good method) or if someone had the users e-mail or other contact information and telling them the proper way that to get deleted. Because as was stated you cannot have them deleted yourself.
Also related, How Can I delete my Account
The best way to do this is tell the person that they have to reach out to the Staff through a Contact Form and showing them the info needed to be deleted. But as was stated in the comments it may be better for other users if the account stays un-deleted, as that means votes and other contributions may be deleted as well. Meaning that other users may lose rep.
The person may always change their mind about the deletion.