caller is VIP onScript function in servicenow

 function onChange(control, oldValue, newValue, isLoading, isTemplate) {

   if (isLoading || newValue === '') {

      return;

   }

var vipalert = g_form.getReference('u_caller',vipFunction);

function vipFunction(vipAlert){

if(vipAlert.vip == 'true'){

g_form.setValue('priority', '1');

alert('The caller is a VIP person');

}

}

   

}