@bot.command("start")
def start_command(chat, message, args):
    btns = botogram.Buttons()
    btns[0].callback("Great", "notify", "Happy to hear that!")
    btns[1].callback("Not so great", "notify", "I'm sorry! What happened?")

    chat.send("How are you feeling?", attach=btns)

@bot.callback("notify")
def delete_callback(query, data, chat, message):
    query.notify(data)