Task: Question Generation
Input (English): #1 return customers 
#2 return services #1 used 
#3 return #1 where #2 is  Close a  policy 
#4 return #1 where #2 is  Upgrade a  policy 
#5 return #3 or  #4 
#6 return customer names of  #5
Output (English): Which customers have used the service named "Close a policy" or "Upgrade a policy"? Give me the customer names.