Look at target for a random wandering ai script C# 5.5 3d

Hey,
I'm struggling a wile whit this one.
but still i did't figure it out.
I want the Nav Mesh Agent look at the direction it is walking.
what can i do to make that happen?!

All help is appreciated!

Code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.AI;
4.  
5. public class WanderingAI : MonoBehaviour
6. {
7.  
8.     public float wanderRadius;
9.     public float wanderTimer;
10.     public float turnSpeed = 7f;
11.  
12.     private Transform target;
13.     private NavMeshAgent agent;
14.     private float timer;
15.  
16.     void OnEnable()
17.     {
18.         agent = GetComponent<NavMeshAgent>();
19.         timer = wanderTimer;
20.     }
21.     void Update()
22.     {
23.         timer += Time.deltaTime;
24.  
25.         if (timer >= wanderTimer)
26.         {
27.             Vector3 newPos = RandomNavSphere(transform.position, wanderRadius, -1);
28.             agent.SetDestination(newPos);
29.             timer = 0;
30.         }
31.     }
32.  
33.  
34.     public Vector3 RandomNavSphere(Vector3 origin, float dist, int layermask)
35.     {
36.         Vector3 randDirection = Random.insideUnitSphere * dist;
37.  
38.         randDirection += origin;
39.      
40.         NavMeshHit navHit;
41.  
42.         NavMesh.SamplePosition(randDirection, out navHit, dist, layermask);
43.  
44.         Vector3 dir = navHit.position - transform.position;
45.         Quaternion lookRotation = Quaternion.LookRotation(dir);
46.         Vector3 rotation = Quaternion.Lerp(transform.rotation, lookRotation, Time.deltaTime * turnSpeed).eulerAngles;
47.         transform.rotation = Quaternion.Euler(0f, rotation.y, 0f);
48.  
49.         return navHit.position;
50.     }
51. }