Serialize object to json dict

        :return: dict

def to_json(self):
        """
        Serialize object to json dict

        :return: dict
        """
        data = dict()
        data['InterlocutorId'] = self.id_
        data['Text'] = self.text
        data['Username'] = self.username
        data['FirstName'] = self.first_name
        data['LastName'] = self.last_name
        return data