Need enemy to attack player and deplete health

So I'm making a slender man sort of game and I have the enemy and the player, and have configured it to chase me when I get within 15 of it, and attack when it gets very close. I need to add a health bar in the UI then link it to my player's health. I want the player to be able to withstand 3 attacks.

Here's the code I have currently:

 using UnityEngine;
 using System.Collections;
 
 public class chase : MonoBehaviour {
 
     public Transform player;
     static Animator anim;
 
     // Use this for initialization
     void Start () 
     {
         anim = GetComponent<Animator>();
     }
     
     // Update is called once per frame
     void Update () 
     {
         Vector3 direction = player.position - this.transform.position;
         float angle = Vector3.Angle(direction, this.transform.forward);
         if (Vector3.Distance (player.position, this.transform.position) < 15 && angle < 40)
         {
             
             direction.y = 0;
 
             this.transform.rotation = Quaternion.Slerp (this.transform.rotation,
                 Quaternion.LookRotation (direction), 0.1f);
 
             anim.SetBool ("isIdle", false);
             if (direction.magnitude > 1) {
                 this.transform.Translate (0, 0, 0.05f);
                 anim.SetBool ("isWalking", true);
                 anim.SetBool ("isAttacking", false);
             } else {
                 anim.SetBool ("isAttacking", true);
                 anim.SetBool ("isWalking", false);
             }
         } else {
             anim.SetBool ("isIdle", true);
             anim.SetBool ("isWalking", false);
             anim.SetBool ("isAttacking", false);
         }
     }
 }

Any help is appreciated, even if it'll be too hard to make a health bar, that's not essential.

Thanks in advance :)