assign post to specific user

and only that user can view and must be notified when this happens

Edit Flow doesn’t provide a way to allow only certain users to view a post.

I tried to look everywhere but could not find how to assign an article to a user or a group

To assign a user to a post:

1. Create a new post or edit an existing post
2. Scroll down to the bottom of the post
3. You should see a section of the post called “Notifications”: http://imgur.com/a/bkT2K
4. To have a user or usergroup follow the post, just click the user or usergroup name

Does that help?