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use feature ":5.14";
use warnings FATAL => qw(all);
...

say "$_, ", ($f1{$_}//'undefined'), ", ", ($f2{$_}//'undefined') for s
+ort keys %names;

2010-nhw-es-ea-285, 2012-10-10, undefined
aab.external.audit.-.bvr.verif.externes, 2012-02-22, undefined
...
abdullah.hassen, undefined, HEALTH PRODUCTS AND FOOD BRANCH 
abdullah.patel, undefined, REGIONS AND PROGRAMS BRANCH
abdullahi.sheikh, 2012-02-28, undefined