Plugin to restrict certain pages for certain users

Basically I need a plugin that will restrict certain users to certain pages. For example I have 2 user. David and Alice. I have 4 pages on my WordPress site. David Page 1, David Page 2, Alice Page 1, Alice Page 2. I will give David log in details (front end, no back end access) where he can log in the password protected site and see David Page 1 and David Page 2, nothing else. I will give Alice log in details where she can only see Alice Page 1 and Alice Page 2, she cannot see Davids pages or even know they exist.

I have tried multiple plugins that are either way too complicated to use ie Role Scooper or they just restrict the whole site for non logged in users, which isnt what I want.

I have tried to password protect the site using the WordPress option but this only blocks out the pages “Content’ but shows everything else like the sliders, gallery etc (I am using a theme that uses page builder, the theme is Co Porlio)

Any help would be more than greatly appreciated!