Melee combat cooldown with animations

Hello,
I’ve this problem, I am using the script from the tutorials and adjusted it to fit with my model’s attack action. But now whenever I click the attack button nothing even happens. the major problem was that the animation doesn’t occur due to cooldown. but now nothing happens at all

using UnityEngine;
using System.Collections;

public class PlayerAttack : MonoBehaviour {
	public GameObject target;
	public float attackcooldown;
	public float attacktimer;

	// Use this for initialization
	void Start () {
		attackcooldown=2.0f;
		attacktimer=0;
	}
	
	// Update is called once per frame

	void Update() {
		if (attacktimer > 0)
						attacktimer -= Time.deltaTime;
		if (attacktimer < 0)
						attacktimer = 0;
		if (Input.GetKey(KeyCode.F) && !animation.isPlaying) 
		{
			if(attacktimer == 0)
			{
			animation.Play("attack 1");
			AttackingEnemy();
			attacktimer = attackcooldown;
			}
		}
		if (Input.GetKey(KeyCode.X)) 
		{
			animation.Play("attack 2");
			
		}
		if (Input.GetKey(KeyCode.Z)) 
		{
			animation.Play("attack 3");
			
		}
}
	private void	AttackingEnemy(){
		float distance = Vector3.Distance (target.transform.position, transform.position);
		Vector3 dir = (target.transform.position - transform.position).normalized;
		float direction = Vector3.Dot (dir, transform.forward);
		if (distance < 2.5) {
						if (direction > 0) {
								EnemyHealth troll = (EnemyHealth)target.GetComponent ("EnemyHealth");
								troll.adjusting (-10);
						}
				}
	}

}

Did you look at your attackTimer while playing? Try to put Debug.Logs throughout your code to see what parts of the code get reached and what not.