You've done well so far. You'll need two if{} statements inside your loop though. One to check if there is a match and one to warn when the user has chosen LA.

Your if statement should check against the loop variable $city instead of your global $myCities.

Normally for lookups I prefer to store the items in a hash. Then you don't need a loop. You just say something like "if ( exists $hash-of-cities{ $input_city }){do-something}". To handle partial inputs you store only the first three letters of the city and match those against the first three letters of the user's input.

A nice bonus add-in would be to store both the city name and it's abbreviation in the hash like this: %cities=( 'New'=>'1', 'NY'=>"1", .... ); then doing a hash lookup with either input will be successful.

Good luck. Keep at it!

#!/usr/bin/perl
#
# cities - lookup cities in a list, take partial inputs
#
use warnings;
use strict;

my $myCities = "Baltimore:Chicago:Los Angeles:New York:San Diego:";
my @myCities = split(':', $myCities);
my $warning = "I'm sorry,we no longer tour LA, please try again.";
my $prompt = <<EOF;
        Please pick one of the following cities by entering any
        portion of the beginning of the city name:
        (Baltimore Chicago Los Angeles New York San Diego)
EOF

print "$prompt\n>";
while ( my $input_city = <STDIN> ) {
   chomp $input_city;
   print "$warning\n" if ( $input_city eq "Los Angeles" );
   foreach my $city ( @myCities) {
        print "Found $input_city\n" if ( $input_city eq $city );
   }
   print ">";
}
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