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//Dialog when user joins conversation
var cFirstRun = true;
bot.on('conversationUpdate', function (message) {
 if (cFirstRun == true) {
        cFirstRun = false; 
        var reply = new builder.Message()
            .address(message.address) //Required
            .text("This is Yaddop's Geography Chatbot")               
            .addAttachment({
                contentUrl:"https://roccobot02gghwh4.blob.core.windows.net/images/chatbot1.jpg",
                contentType: 'image/jpg',
                name: 'chatbot1.png'
            });
        bot.send(reply);
        setTimeout(function(){
            var reply = new builder.Message()
                .address(message.address) //Required
                .text('I can help you with questions regarding countries and capital cities.');      
            bot.send(reply);
        }, 3000);
    }   
});