Need help in Checking cells in different files and showing results in the next cell

Hi to all,

I'm new here and I need help on monitoring two files.
I'm trying to check 2 separate files. Looking if a cell (example A3 in file1) exist in Column A of file2. If so, than copy file2 B3 cell next to File 1 A3 that should be File1 B3.
If does't exist than show an error or ''Doesn't exist"
I'm attaching a file example...

Anticipated Thanks