[{'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 this policy We reserve the right to make changes to this privacy policy, so please check back periodically for changes. You will be able to see that changes have been made by checking to see the effective date posted at the end of the policy. If Verizon elects to use or disclose information that identifies you as an individual in a manner that is materially different from that stated in our policy at the time we collected that information from you, we will give you a choice regarding such use or disclosure by appropriate means, which may include use of an opt out mechanism."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]