enemy does not follow the player

here is my script that,

var Player : Transform;

 var ChaseSpeed = 1.0;

 var RotateAroundSpeed = 20;

 var timeToChange: float = 0;

 var minTime: float = 1; // min time to revert direction

 var maxTime: float = 5; // max time to revert direction

 private var direction: float = 1;

 

 function Update (){

 DetectDistance ();

 }

 

 function DetectDistance () {

       

     var dist = Vector3.Distance(Player.position, transform.position);

     Debug.Log ("Distance to player: " + dist);

       

     if(dist <= 3.5){

    

     RotateAroundPlayer();

            

     }    else {

         ChasePlayer ();

         }

     }

 

 function ChasePlayer () {

     transform.position = Vector3.Lerp(transform.position, Player.position, Time.deltaTime / ChaseSpeed);

 

 }    

 function RotateAroundPlayer () {

      if (Time.time > timeToChange){

         timeToChange = Time.time + Random.Range(minTime, maxTime);

         direction = -direction;

     }

     var Rotate_Speed = Random.Range(1,RotateAroundSpeed);

     transform.RotateAround (Player.position, Vector3.up, direction * Rotate_Speed  * Time.deltaTime);

     }

enemy does not follow and the player when the player get closer to the enemy. First I occured the script code and slipped it into enemy prefab, then choosed player as target. the steps are all but ı could not get anythıng about it. could you please help me. thanks.