Camera not slowly moving to object

can anyone help me. i need the camera to move slowly to the PosB but what it does is the camera snaps. heres the code

using UnityEngine; using System.Collections;

public class NewCameraScript : MonoBehaviour {

 public Transform Target;
 public Transform PosB;
 public Camera cam;
 public float speed;
 public float dampTime;

 public bool changeView = false;


 // Use this for initialization
 void Start () {


 }
 
 // Update is called once per frame
 void Update () {
 


 }


 void OnCollisionEnter2D(Collision2D col)
 {
     


     if(col.gameObject.tag == "Player")
     {
         changeView = true;
         if(changeView = true)
         {
             
             Debug.Log("sadsdahj");
             Lerping();

         }
     }


 }



 void OnCollisionExit2D(Collision2D col)
 {

     if(col.gameObject.tag == "Player")
     {
         changeView = false;
     }
     

 }


 void Lerping()
 {


     //float dampp = dampTime * Time.deltaTime;
     //cam.transform.localPosition = Vector3.Lerp(Target.position,PosB.position,dampTime);
     cam.transform.position = Vector2.Lerp(Target.transform.position,PosB.transform.position,dampTime);
     cam.transform.position = new Vector3(transform.position.x+1,Target.transform.position.y - PosB.transform.position.y,-50);

 }

}