index.js

var intents = new builder.IntentDialog({ recognizers: [recognizer] })
.matches('Greeting', (session, args) => {
    session.send('oh Halo.');
})
.matches('None', (session, args) => {
    session.send("Hrm.. I didn't understand that. Can you say it differently")    
})
.onDefault((session) => {
    session.send('Sorry, I did not understand \'%s\'.', session.message.text);
});
bot.dialog('/', intents);