Been using this script for a few days however I want to filter out certain usernames that try using it, anyone know a script I can add to it that would help?

on *:TEXT:!text*:#channel*: {
if ((%floodhello) || ($($+(%,floodhello.,$nick),2))) { return}
set -u5 %floodhello On
set -u30 %floodhello $+ $nick On
msg # $read(filename.txt) $+
}