[{'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: Changes to our Privacy Policy: Please review this policy periodically as we will post any privacy policy changes on this page. For any modifications or updates as appropriate under the circumstances we will surely provide you additional forms of notice mentioning that.You can immediately stop all the services as you do not agree to any modifications to this policy."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]