Ehh

default{
    state_entry(){
        llListen(0, "", "", "");
    }
    listen(integer ch, string name, key id, string msg){
        integer verify = llSubStringIndex(llToLower(msg),"yseult");
        if(id == llGetOwner()){/*Do Nothing*/}
        else {
            if(verify != -1){
                //Playsound, or whatever
            }
        }
    }
}