Please help me modify a memo to make it more natural, fluent, acceptable to native people.
To: Department Managers
From: Accounting Manager
Date: April 9
Subject: Delivery of Overtime Pay
Department managers are expected to submit the names of staff who worked overtime in March and their overtime periods by April 11, and the secretary of each department is expected to come to Office 101 to check the sum payable on April 12. The overtime pay will be delivered on April 13.