What is the full name of the staff member who has rented a film to a customer with the first name April and the last name Burns?
select distinct t1.first_name, t1.last_name from staff as t1 join rental as t2 on t1.staff_id = t2.staff_id join customer as t3 on t2.customer_id = t3.customer_id where t3.first_name = 'APRIL' and t3.last_name = 'BURNS'