[{'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: From time to time, we may ask you to complete a voluntary survey in order to help us provide a better user experience. We will only request and therefore collect non-personal data."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]