It's fairly a regular request you might come across that your user is requesting for email reset link directly to their email account for some login related issue. You can handle this kind of request at ease from CRM Profile for that user.
For your information, you can edit any user password or send a reset email under Account Settings on their CRM profile.
Just, so you know, when you send out Newsletters it also includes login request built in. So, if you are sending the direct link through the newsletter engine it should auto-log them in if enabled.