Retrieve the open and close dates of all the policies associated with the customer whose name contains "Diana"
return customers ;return names of  #1 ;return #1 where  #2 contains Diana ;return policies of  #3 ;return open dates of  #4 ;return close dates of  #4 ;return #5 ,  #6
['select', 'project', 'comparative', 'project', 'project', 'project', 'union']