code: function setCallback (action, callbackContext = null, callbackText = null) {
          const callbackAction = this.toAbsoluteAction(action);
  
          this.setState({
              [ACTION]: callbackAction,
              [CONTEXT]: callbackContext || DEFAULT,
              [TEXT]: callbackText
          });
  
          return this;
      }
docs: Sets action, where to go back, when user responds with text
  
  @param {string} action - relative or absolute action (usualy current action)
  @param {string|null} [callbackContext] - context of callback
  @param {string|null} [callbackText] - custom text response
  @returns {this}
  @alias module:callbackMiddleware
  @deprecated - use res.runBookmark()
  @typicalname res
  @example
  
  bot.use('myAction', (req, res) => {
  res.setCallback('myAction'); // return back
  });