void main()
{
    //Get object that just entered trigger and assign to variable oPlayer
    object oPC = GetEnteringObject();
    object oNPC = GetEnteringObject();
    object olvl = GetObjectByTag("leveler");

    //Check to see if entering object is really a player
if (!GetIsPC(oPC)) return;

    if (GetIsPC(oNPC))
    {
        //Check to see if player has the gate key
        if (GetXP(oNPC) < 2001 ) // Player is less than level 4
        {
            //Code here to bring up the conversation
            AssignCommand(olvl, ClearAllActions());

             // walk NPC to the PC.  If you want NPC to run change FALSE to TRUE.
            AssignCommand(olvl, ActionMoveToObject(oNPC, TRUE));
            // start talking to PC.
            AssignCommand(olvl, ActionStartConversation(oNPC, "", TRUE));
        } //End if
    } //End if
} //End main