Single Camera Lerping between three characters? (code provided)

I have an empty gameobject that has the camera as a child and im simply trying to make the object lerp to the players x positions. I have it storing the position when 1,2,3 is pressed and switching to the corresponding character but I can't seem to make a smooth lerp transition in between. I need to make it so that when the player presses 1-2-3 it lerps to that players location. (and can be done in any order)

Basically a sliding gameobject that will place itself in the desired characters position and then it has a camera parented with an offset.

Or if anyone has a straightforward camera method that will target and offset behind each character on a lerp please feel free to speak up. :)

using UnityEngine; using System.Collections;

public class CameraScript : MonoBehaviour {

 public Vector3 oldCamPos;
 public GameObject player1;
 public GameObject player2;
 public GameObject player3;
 public float smooth;
 public bool omar=false;
 public bool rach=false;
 public bool bran=false;

 void Start()

 {
     Vector3 oldCamPos = new Vector3(player1.transform.position.x, player1.transform.position.y, player1.transform.position.z);

 }

 void Update()
 {
     if (Input.GetKeyDown (KeyCode.Alpha1)) {
         omar = true;
         oldCamPos = new Vector3 (player1.transform.position.x, player1.transform.position.y, player1.transform.position.z);
         CameraSwitch ();

     }
     
         

     if (Input.GetKeyDown (KeyCode.Alpha2)) {
         rach = true;
         oldCamPos = new Vector3 (player2.transform.position.x, player2.transform.position.y, player2.transform.position.z);
         CameraSwitch ();
     }
     

     if (Input.GetKeyDown (KeyCode.Alpha3)) {
         bran = true;
         oldCamPos = new Vector3 (player3.transform.position.x, player3.transform.position.y, player3.transform.position.z);
         CameraSwitch ();
     }
 }




     ///////////////////////////////////////////////////////////////////////////////////////





 void CameraSwitch()
     {
     if (omar) {

         transform.position = Vector3.Lerp (oldCamPos, player1.transform.position, Time.deltaTime * .1f);
         //transform.rotation = Quaternion.Lerp (player1.transform.rotation, player1.transform.rotation, Time.deltaTime * smooth);

         //yield return new WaitForSeconds(1);
         omar = false; 
     }


     if (rach) {

         transform.position = Vector3.Lerp (oldCamPos, player2.transform.position, Time.deltaTime * .1f);
         //transform.rotation = Quaternion.Lerp (player2.transform.rotation, player2.transform.rotation, Time.deltaTime * smooth);

         //yield return new WaitForSeconds(1);
         rach= false;

     }



     if (bran) {

         transform.position = Vector3.Slerp (oldCamPos, player3.transform.position, Time.deltaTime * smooth);
         //transform.rotation = Quaternion.Slerp (player3.transform.rotation, player3.transform.rotation, Time.deltaTime * smooth);

         //yield return new WaitForSeconds(1);
         bran = false; 

     }

     


 }







 
 

}