List the first name and last name of customers have the amount of outstanding between 1000 and 3000.
return customers ;return amounts outstanding of  #1 ;return #1 where  #2 is at least 1000 ;return #1 where  #2 is at most 3000 ;return #1 of  both #3 and #4 ;return first names of  #5 ;return last names of  #5 ;return #6 ,  #7
['select', 'project', 'comparative', 'comparative', 'intersection', 'project', 'project', 'union']