How to make a Hostage Rescue Mechanics. (Counter Strike)

Hi. I am new to Unity Coding (C#). I am working on a project where I am trying to learn the Game Mechanics. I am trying to learn the logic of the Hostage Rescue Scene from the famous Game: Counter Strike. Where the CTs rescue the Hostages to their Spawn Location, and then they disappear & print a message : "Hostage has been rescued."

I have made a NPC Cube that follows the Player Cube. I have set up a Trigger Event at the Rescue Location & attached a script to it that says : Hostage has been Rescued." But the Problem I am facing is the NPC Cube doesn't come inside the Trigger (Box Collider). It stays away from it maintaining a Distance. As I am new, I do not have any knowledge about Layers & how to ignore them or use them.

So can anybody please help me achieving this.

The NPC Script

public class NPCFollow : MonoBehaviour {

 public GameObject NPC;
 public GameObject Player;
 public float FollowSpeed = 1;
 public float TargetDistance;
 public float AllowedDistance = 5;
 public RaycastHit hit;
 private Rigidbody rb = null;
 
 private void Start() 
 {       
     rb = GetComponent<Rigidbody>();
 }  

 private void Update() 
 {
     transform.LookAt(Player.transform);

     if(Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, 10))
     {

         TargetDistance = hit.distance;

         if(TargetDistance >= AllowedDistance)
         {
             Debug.DrawRay(transform.position, transform.forward * 10, Color.red);

             transform.position = Vector3.MoveTowards(transform.position, Player.transform.position, FollowSpeed * Time.deltaTime);
             //transform.position -= MalePlayer.transform.position;
         }
     }    
 } }

The Hostage Rescue Script (Attached to the Box Collider - with the Trigger set to Active) public class RescueHostage : MonoBehaviour {

 public GameObject Player;
 public GameObject NPC;

 private void Start() 
 {
     Debug.Log("Rescuse the Hostage!");
 }

 private void OnTriggerEnter(Collider other) 
 {
     if(other.name == "Hostage")           
     {
         Debug.Log("Hostage Rescued.");
     }
 }  }