defaultRouting(bot, session, results) {
    const route = bot.libraries.BotBuilder.constructor.bestRouteResult(
      results,
      session.dialogStack(),
      bot.name
    );
    if (route) {
      return bot.library(route.libraryName).selectRoute(session, route);
    }
    return session.routeToActiveDialog();
  }
Route to a default route of the bot. First the route is calculated as the
best route based on the results and the dialog stack. If no best route exists
then is routed to the active dialog.
@param {Object} bot Microsoft Bot Framework Universal Bot instance.
@param {Object} session Microsoft bot framework session.
@param {Object} results Results for the routing.