Bare-bones example of using the Dialogue Designer Unity package (https://github.com/BrianMacIntosh/DialogueDesignerUnity)

DialogueDesignerExample.cs

using UnityEngine;

// Include the DialogueDesigner namespace
using DD;

/// <summary>
/// Complete example that plays a Dialogue Designer dialogue in the unity debug console.
/// Use the number keys to make choices.
/// </summary>
public class DialogueDesignerExample : MonoBehaviour
{
	// The dialogue to play
	// Drop the conversation file asset in here using the Inspector
	public TextAsset DialogueFile;

	// The conversation, parsed and loaded at runtime
	private Dialogue m_loadedDialogue;

	// A player that can track progress through the dialogue
	private DialoguePlayer m_dialoguePlayer;

	void Start()
	{
		// load the dialogue
		m_loadedDialogue = Dialogue.FromAsset(DialogueFile);

		// create a player to play through the dialogue
		m_dialoguePlayer = new DialoguePlayer(m_loadedDialogue);

		// set up your unique code to display dialogues
		DialoguePlayer.GlobalOnShowMessage += OnShowMessage;
		DialoguePlayer.GlobalOnEvaluateCondition += OnEvaluateCondition;
		DialoguePlayer.GlobalOnExecuteScript += OnExecuteScript;

		// if you want to handle a particular dialogue differently, you can use these instead
		//m_dialoguePlayer.OverrideOnShowMessage += OnShowMessageSpecial;
		//m_dialoguePlayer.OverrideOnEvaluateCondition += OnEvaluateConditionSpecial;
		//m_dialoguePlayer.OverrideOnExecuteScript += OnExecuteScriptSpecial;

		m_dialoguePlayer.OnDialogueEnded += OnDialogueEnded;

		// start playing the dialogue
		m_dialoguePlayer.Play();
	}

	private void OnDialogueEnded(DialoguePlayer sender)
	{
		Debug.Log("[Dialogue Ended]");
	}

	void Update()
	{
		// don't forget to update all players every frame if you want to use Wait nodes
		m_dialoguePlayer.Update();

		// wait for player input on any Show Message Node, then advance
		ShowMessageNode showMessageNode = m_dialoguePlayer.CurrentNode as ShowMessageNode;
		if (showMessageNode != null)
		{
			ShowMessageNodeChoice choiceNode = showMessageNode as ShowMessageNodeChoice;
			if (choiceNode != null)
			{
				// the player must make a choice with the number keys
				int numberInput = GetAlphaNumberDown();
				Debug.LogWarning(numberInput);
				if (numberInput >= 1)
				{
					m_dialoguePlayer.AdvanceMessage(numberInput - 1);
				}
			}
			else
			{
				// the player must press 1 to proceed to the next node
				if (Input.GetKeyDown(KeyCode.Alpha1))
				{
					m_dialoguePlayer.AdvanceMessage(0);
				}
			}
		}
	}

	private void OnShowMessage(DialoguePlayer sender, ShowMessageNode node)
	{
		// display the text of the node
		Debug.Log(node.GetText("ENG"));

		ShowMessageNodeChoice choiceNode = node as ShowMessageNodeChoice;
		if (choiceNode != null)
		{
			// choice nodes have multiple choices for the player to choose from
			for (int i = 0; i < choiceNode.Choices.Length; i++)
			{
				Debug.LogFormat("{0}.) {1}", i + 1, choiceNode.GetChoiceText(i, "ENG"));
			}
		}
		else
		{
			// non-choice nodes only have one option
			Debug.Log("1.) Continue");
		}
	}

	private bool OnEvaluateCondition(DialoguePlayer sender, string script)
	{
		// You may parse and evaluate a condition string however you like
		// This is left as an exercise for the reader
		return false;
	}

	private void OnExecuteScript(DialoguePlayer sender, string script)
	{
		// You may parse and execute a script string however you like
		// This is left as an exercise for the reader
	}

	/// <summary>
	/// Helper function - returns the number key the player just pressed down, or -1 if none.
	/// </summary>
	private int GetAlphaNumberDown()
	{
		for (int i = 0; i < 10; i++)
		{
			if (Input.GetKeyDown(KeyCode.Alpha0 + i))
			{
				return i;
			}
		}
		return -1;
	}
}

It's super minor but Line 37: ONEvaluateConditionSpecial should be OnEvaluateConditionSpecial

Thanks! Fixed it.