Scriptum/Assets/NPCType.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NPCType : MonoBehaviour
{

    public GameObject lumberjack;
    public int isQuest;
    public string name;
    public string name2;

    void Start()
    {

        NPCDialogue npcdialogue = lumberjack.GetComponent<NPCDialogue>();
        name = npcdialogue.name;
        int continued = PlayerPrefs.GetInt("continued");
        if (continued == 1)
        {
            isQuest = PlayerPrefs.GetInt(name2);
        }
        else
        {
            isQuest = PlayerPrefs.GetInt(name);
        }
        npcdialogue.isQuest = isQuest;
    }

    void Update()
    {
        NPCDialogue npcdialogue = lumberjack.GetComponent<NPCDialogue>();
        isQuest = npcdialogue.isQuest;
        PlayerPrefs.SetInt(name, isQuest);
    }

    public void SaveCheckpoint()
    {
        NPCDialogue npcdialogue = lumberjack.GetComponent<NPCDialogue>();
        isQuest = npcdialogue.isQuest;
        PlayerPrefs.SetInt(name2, isQuest);
    }
}