Formula to Flag names in list 1 that do not exist in list 2.

Hi all,

In the attached spreadsheets are two lists of names - note that in each list, there are duplicates - one name can appear in multiple lines.

I am hoping for some help finding a formula that will Flag (fill the cell with color) names in "Contact List 2" which do not appear in "Contact List 1". If a name in Contact List 2 meets these conditions, all instances of that name should be flagged.

Thank you so much in advance for your time! Let me know if you have any more information.