Model doesn't move in touch direction - unity3d

Question

Code:
private Touch touch;
public float speed;
public Animator animator;
Vector3 point = new Vector3();
Vector3 targetPos;
void Start()
{
targetPos = transform.position;
}
void Update()
{
if (Input.touchCount > 0)
{
touch = Input.GetTouch(0);
if (touch.phase == TouchPhase.Moved)
{
transform.position = new Vector3(transform.position.x + touch.deltaPosition.x * Time.deltaTime, transform.position.y, transform.position.z + touch.deltaPosition.y * Time.deltaTime);
Plane plane = new Plane(Vector3.up,transform.position);
Ray ray = Camera.main.ScreenPointToRay(touch.deltaPosition);
float point = 0f;
if (plane.Raycast(ray, out point)) targetPos = ray.GetPoint(point);
transform.LookAt(targetPos);
}
}
}
The problem is when I touch the screen the character looks in the touched direction, but when I move it forward (bottom of the screen to slightly above) it still looks towards the touch position. I want it so when it moves it faces the direction its going.

Answer 1

touch = Input.GetTouch(0);
if(touch.phase == TouchPhase.Moved)
{
transform.position = new Vector3(transform.position.x + touch.deltaPosition.x *
Time.deltaTime,transform.position.y,
transform.position.z + touch.deltaPosition.y * Time.deltaTime);
transform.LookAt(transform.position + touch.deltaPosition);
}