Help to Move objects with mouse click

Hi, I have the following scene with a script working but I need to make a little change, when I click on the map and the object start moving the box move as is (straight forward), and I need that if the box is facing north and click to south I need the box to rotate and face south. See picture

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. public class TapToMove : MonoBehaviour {
4. //flag to check if the user has tapped / clicked.
5. //Set to true on click. Reset to false on reaching destination
6. private bool flag = false;
7. //destination point
8. private Vector3 endPoint;
9. //alter this to change the speed of the movement of player / gameobject
10. public float duration = 50.0f;
11. //vertical position of the gameobject
12. private float yAxis;
13. void Start(){
14.   //save the y axis value of gameobject
15.   yAxis = gameObject.transform.position.y;
16. }
17.  
18. // Update is called once per frame
19. void Update () {
20.   //check if the screen is touched / clicked
21.   if((Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began) || (Input.GetMouseButtonDown(0)))
22.   {
23.    //declare a variable of RaycastHit struct
24.    RaycastHit hit;
25.    //Create a Ray on the tapped / clicked position
26.    Ray ray;
27.    //for unity editor
28.    #if UNITY_EDITOR
29.    ray = Camera.main.ScreenPointToRay(Input.mousePosition);
30.    //for touch device
31.    #elif (UNITY_ANDROID || UNITY_IPHONE || UNITY_WP8)
32.    ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
33.    #endif
34.    //Check if the ray hits any collider
35.    if(Physics.Raycast(ray,out hit))
36.    {
37.     //set a flag to indicate to move the gameobject
38.     flag = true;
39.     //save the click / tap position
40.     endPoint = hit.point;
41.     //as we do not want to change the y axis value based on touch position, reset it to original y axis value
42.     endPoint.y = yAxis;
43.     Debug.Log(endPoint);
44.    }
45.  
46.   }
47.   //check if the flag for movement is true and the current gameobject position is not same as the clicked / tapped position
48.   if(flag && !Mathf.Approximately(gameObject.transform.position.magnitude, endPoint.magnitude)){ //&& !(V3Equal(transform.position, endPoint))){
49.    //move the gameobject to the desired position
50.    gameObject.transform.position = Vector3.Lerp(gameObject.transform.position, endPoint, 1/(duration*(Vector3.Distance(gameObject.transform.position, endPoint))));
51.   }
52.   //set the movement indicator flag to false if the endPoint and current gameobject position are equal
53.   else if(flag && Mathf.Approximately(gameObject.transform.position.magnitude, endPoint.magnitude)) {
54.    flag = false;
55.    Debug.Log("I am here");
56.   }
57.  
58. }
59. }

Any help appreciated.
Regards.

 

Quaternion.LookRotation passing in the endPoint as the forward vector should work.

http://docs.unity3d.com/ScriptReference/Quaternion.LookRotation.html

 

Thanks for the reply, what do i need to change in the code to implement Quaternion.LookRotation?