public void turnTo(Vector3 point) { Vector3 direction = point - transform.position;

    // Rotate towards the target
    transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), AI.rotationSpeed * Time.deltaTime);

    transform.eulerAngles = new Vector3(0, transform.eulerAngles.y, 0);
}

This will help you. But do not run this cript wen player to far. Best way is to use 2 playnes with out anu rotation scripts