How can i change Scene when my dialogue is end

Hey guys, i'm making 2D game that will be dialogue at the beggining and i want to change scene when my dialogue end. but i dont know how to do that maybe t$$anonymous$$s is a simple question but i'm pretty new in C#

CODE:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using TMPro;
 using UnityEngine.SceneManagement;
 
 public class Dialogue : MonoBehaviour
 {
     public TextMeshProUGUI textDisplay;
 
     [TextArea(3, 20)]
     public string[] sentences;
     private int index;
     public float typingSpeed;
     public GameObject continueButton;
 
     private void Start()
     {
         StartCoroutine(Type());
 
 
     }
 
     private void Update()
     {
         if(textDisplay.text == sentences[index])
         {
             continueButton.SetActive(true);
         }
         if(WHAT SHOULD İ WOULD WRİTE HERE)
         {
             SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
         }
 
 
 
     }
 
 
     IEnumerator Type()
     {
          foreach(char letter in sentences[index].ToCharArray())
         {
             if (Input.GetKey(KeyCode.J))
             {
                 textDisplay.text += letter;
             }
             else
             {
                 textDisplay.text += letter;
                 yield return new WaitForSeconds(0.04f);
             }
         }
     }
 
     public void NextSentences()
     {
         continueButton.SetActive(false);
 
         if(index< sentences.Length -1)
         {
             index++;
             textDisplay.text = "";
             StartCoroutine(Type());
         }
         else
         {
             textDisplay.text = "";
             continueButton.SetActive(false);
         }
     }
 }