//Create a file called helpers.js
//Add the following code:
module.exports = function () {

     /**
     * Returns a random integer between min (inclusive) and max (inclusive)
     * Using Math.round() will give you a non-uniform distribution!
     */
    global.getRandomInt = function (min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }

    global.random_greeting = [
        'Greetings new friend.',
        "Hello there!",
        "Having fun I hope?",
        "Glad we've met.",
        "Happy to help!"
    ]
}

//In app.js include the following code:
require('./helpers.js')();

//Then in the dialog section, add this:
var randint = getRandomInt(0, random_greeting.length-1);

//To display the random greeting, then add something like this:
.text(random_greeting[randint] +" This is Yaddops' Geography Chatbot")