Need help describing these two diagrams on a Library Management System.

DATA FLOW DIAGRAM (DFD) Display REPORTS Student Book search Command data Command data Store details Reserve Student data Reserve Maintain Modify/ Insert Student Issue Update Issue Display status Command data Handle details Collect Command Return Update Issue Return BOOKS LIBRARY STAFF Use Case Diagram Login Renew book Search for book Student Librarian Check out book Reserve book Add book Return book Delete book Check Account Report invalid - - X Edit book /title IDs DATA FLOW DIAGRAM (DFD) Display REPORTS Student Book search Command data Command data Store details Reserve Student data Reserve Maintain Modify/ Insert Student Issue Update Issue Display status Command data Handle details Collect Command Return Update Issue Return BOOKS LIBRARY STAFF Use Case Diagram Login Renew book Search for book Student Librarian Check out book Reserve book Add book Return book Delete book Check Account Report invalid - - X Edit book /title IDs