Shopkeeper/Innkeeper

var innKeeper = "";
var playerName = "";
var helmet = null;
var player = null;
var playerOldX;
var playerOldY;
var playerOldZ;
var timerID = 3;
var delay = 100;

function init(event)
{
    innKeeper = event.npc.display.getName();
}

function interact(event)
{
    player = event.player;
}

function dialog_option(event)
{
    var dia = { start:{id:66, option:1} }
    var currency = { id:"customnpcs:npcCoinIron", dmg:0, amount:20 }
    if(event.dialog.id == dia.start.id && event.option.slot == dia.start.option) {
        var itemsTaken = event.player.removeItem(currency.id,currency.dmg,currency.amount);
        if(itemsTaken)
        {
            playerOldX = event.player.getX();
            playerOldY = event.player.getY();
            playerOldZ = event.player.getZ();
            playerName = event.player.getName();
            helmet = event.player.getArmor(3);
            if(helmet != null) {helmet = helmet.copy()};
            event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ /effect @p 15 5 4 true");
            event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ /effect @p 16 5 4 true");
            event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ /tp @p 1797 7 -1343");
            event.player.setArmor(3, event.player.world.createItem("minecraft:pumpkin",0,1));
            event.npc.timers.start(timerID, delay, false);
        } else {
            event.player.showDialog(63, innKeeper);
        }
    }
}

function timer(event)
{
    if(event.id == 3)
    {
        event.npc.executeCommand("/execute "+event.npc.UUID+" ~ ~ ~ /tp "+playerName+" "+playerOldX+" "+playerOldY+" "+playerOldZ+"");
        player.setArmor(3, helmet);
        playerName = "";
        helmet = null;
    }
}