[{'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: For changes to this privacy statement that may be materially less restrictive on our use or disclosure of personal information you have provided to us, we will obtain your consent before implementing the change. Please contact us if you have questions."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]