I made a few adjustments. I tried to stay close to your script, but note that you will need to look deeper at Microsoft's documentation.

#!/usr/bin/perl 

use strict;
use warnings; 
use SOAP::Lite 
(+trace => 'all', maptype => {});

my $soap = SOAP::Lite 
-> uri('urn:Example1') 
-> on_action(sub{sprintf '%s/%s', @_ }) 
-> proxy('http://localhost/HelloWorld.asmx')
-> sayHello(SOAP::Data->type('string')->name('name')); 

print $soap->sayHello()->result;
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