CortanaController.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;

public class CortanaController : MonoBehaviour {
    public GameObject botUIPanel;
    public List<string> questions = new List<string>();
    public List<string> answers = new List<string>();

    public Text questionOptions;
    // Use this for initialization
    void Start() {
        questionOptions.text = "ASK ME\n";
        foreach (string s in questions) {
            questionOptions.text += s + '\n';
        }
    }
    void Update() {
        ActiveVoiceCommand();
    }

    public void ActiveVoiceCommand() {
        Dictionary<string, string> qaList = new Dictionary<string, string>();
        for (int i = 0; i < questions.Count; i++) {
            string question = questions[i];
            string answer = answers[i];
            qaList.Add(question, answer);
        }

        Windows10Interop.GetMeSomeVoice(qaList);
        botUIPanel.SetActive(true);
    }

// not used so far
    public void InActiveVoiceCommand() {
        Windows10Interop.StopVoice();
        botUIPanel.SetActive(false);
    }


}

The file is based on the following sample solution. I'll appreciate such a good sample and explanation!

https://digitalerr0r.wordpress.com/2015/10/21/voice-activating-your-windows-10-games-using-speech-synthesis-voice-recognition-and-cortana/