docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'intent') and self.intent is not None:
              _dict['intent'] = self.intent
          if hasattr(self, 'confidence') and self.confidence is not None:
              _dict['confidence'] = self.confidence
          if hasattr(self, '_additionalProperties'):
              for _key in self._additionalProperties:
                  _value = getattr(self, _key, None)
                  if _value is not None:
                      _dict[_key] = _value
          return _dict