[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: XII. Changes to Privacy Policy We reserve the right to update or modify this Privacy Policy at any time and from time to time. Please review this Privacy Policy periodically, and especially before You provide any information. This Privacy Policy was made effective on the date indicated above."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]