Why are some of my methods being skipped?

I am creating a dialogue system that continues the dialog every time a key is pressed. However, when it comes to dialogue that involves choices, only the first choice dialogue plays. Both choice dialogue and non-choice dialogue use the same method, ReadLine(), but choice dialogue includes a number that prevents the dialogue from playing unless it matches the number determined by the choices. There are no differences in the conditions for the choice dialogue, so I do not know what is missing that allows it to be skipped. Thanks in advance for the help. Here is what I currently have:

Dialogue Script:

 //Play dialogue:
     void Update()
     {
         ToggleDialogueBox();
         ReadLine("David", "This is a test.");
         ReadLine("Alfred", "Did it work?");
         ReadLine(null, "Did the text type out like a typewriter?");
         AskQuestion(null, "What do you think?");
         ReadLine("You", "Yes.", 1);
         ReadLine("David", "We agree.", 1);
         ReadLine(null, "Goodbye.");
         ToggleDialogueBox();
     }
 
     //Type dialogue:
     void ReadLine(string name, string text)
     {
         TypeDialogue(name, text);
 
         if ((textBox.text == text || nameBox.text == text) && dialogueScript.Count > textIndex && Input.GetKeyDown(KeyCode.T))
         {
             textIndex++;
         }
     }
 
     //Type dialogue for choices (overload):
     void ReadLine(string name, string text, int num)
     {
         if (num == choiceNum)
         {
             TypeDialogue(name, text);
         }
 
         if ((textBox.text == text || nameBox.text == text) && dialogueScript.Count > textIndex && Input.GetKeyDown(KeyCode.T))
         {
             textIndex++;
         }
     }
 
     //Get choices:
     void AskQuestion(string name, string text)
     {
         choiceNum = 0;
 
         TypeDialogue(name, text);
 
         if ((textBox.text == text || nameBox.text == text) && dialogueScript.Count > textIndex)
         {
             if (Input.GetKeyDown(KeyCode.O))
             {
                 choiceNum = 1;
                 textIndex++;
             }
 
             if (Input.GetKeyDown(KeyCode.P))
             {
                 choiceNum = 2;
                 textIndex++;
             }
         }
     }
 
     //Function for conversation:
     void TypeDialogue(string name, string text)
     {
         if (dialogueScript.Count == textIndex && dialogueBox.gameObject.activeSelf)
         {
             string[] line = { name, text };
 
             if (!dialogueScript.Contains(line))
             {
                 dialogueScript.Add(line);
             }
 
             if (dialogueScript[textIndex][0] == null)
             {
                 nameBox.text = string.Empty;
             }
             else
             {
                 nameBox.text = name;
             }
 
             textBox.text = string.Empty;
             StartCoroutine(TypeLine(dialogueScript[textIndex][0], dialogueScript[textIndex][1]));
         }
     }
 }