public function onEnable(): void {
    NpcDialog::register($this);
}

$nbt = Entity::createBaseNBT($player, null, $player->yaw, $player->pitch);
$entity = Entity::createEntity("Zombie", $player->level, $nbt);
$entity->spawnToAll();

$entity->setNameTag("Jerry The Zombie!");

$form = new DialogForm("This is the dialog text");
 
$form->addButton(new Button("Hi", function(Player $player) {
    $player->sendMessage("Hi!!");
}));

$form->setCloseListener(function(Player $player) {
    $player->sendMessage("You closed the form!");
});

$form->pairWithEntity($entity);