How to make 3D text appear after conversation is complete?

I have an office game where I need to talk to an NPC and then after clicking the right text buttons, a 3D text in front of the elevators appears that you can click on to go the next level. This is a repurposed main menu script I found in a tutorial and it will load the next level when you click it:

 var LevelToLoad : String;
     var soundhover : AudioClip;
     var beep : AudioClip;
     var QuitButton : boolean = false;
     function OnMouseEnter(){
     audio.PlayClick(soundhover);
     }
     function OnMouseUp(){
     audio.PlayBeep(beep)
     yield new WaitForSeconds(0.35);
     if(QuitButton){
     Application.Quit();
     }
     else{
     Application.LoadLevel(LevelToLoad);
     }
     }
     @script RequireComponent(AudioSource)

Here is a conversation script I managed to find in a halfway done tutorial that was never completed and it is the closest thing I have for talking to an NPC:

 using UnityEngine;
 using System.Collections;
 
 public class myDialog : MonoBehaviour {
     
     string[] NPCTalk = new string[5];
     string[] PCTalk = new string[5];
     int myIndex = 0;
     bool myTalking = true;
 
     void Start(){
 
         NPCTalk[0] = "What's your name?";
         NPCTalk[1] = "Nice to meet you.";
         NPCTalk[2] = "How are you?";
         NPCTalk[3] = "I'm fine.";
         NPCTalk[4] = "Goodbye.";
 
         PCTalk[0] = "My name is Bob.";
         PCTalk[1] = "Nice to meet you too.";
         PCTalk[2] = "I'm doing well.  How are you?";
         PCTalk[3] = "I need to get going.";
         PCTalk[4] = "Goodbye";
                 }
 
         void OnGUI () {
             if(myTalking){
                 GUI.Label(new Rect (575, 200, 150, 150), NPCTalk[myIndex]);
                 if (GUI.Button(new Rect(575, 250, 150, 30), PCTalk[myIndex]))
                     if(myIndex >= 4)
                         myIndex = 4;
                 else
                     myIndex++;
                 if (GUI.Button(new Rect(575, 300, 150, 30), "Say again."))
                     myIndex = 0;
                 if (GUI.Button(new Rect(575, 350, 150, 30), "Bye!"))
                     myTalking = false;
         }
     }
 }

I just need to figure out how the 3D text will appear after the conversation has ended. I do realize that the first script is in Javascript and the second is in C#. If anyone can point me in the right direction or link me to a tutorial that shows how to do that it would be greatly appreciated.