[{'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: Auto-renewals and Trials. IF THE CUSTOMER'S ACCOUNT IS SET TO AUTO-RENEWAL OR IS IN A TRIAL PERIOD, DROPBOX (OR THE CUSTOMER'S RESELLER) MAY CHARGE AUTOMATICALLY AT THE END OF THE TRIAL OR FOR THE RENEWAL, UNLESS THE CUSTOMER NOTIFIES DROPBOX (OR THE CUSTOMER'S RESELLER, AS APPLICABLE) THAT THE CUSTOMER WANTS TO CANCEL OR DISABLE AUTO-RENEWAL. Dropbox may revise Service rates by providing the Customer at least thirty days' notice prior to the next charge."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]