private void ReturnBook(Guid copyId)
        {
            LibraryService service = ServiceFactory.CreateLibraryService();
            ReturnBookRequest request = new ReturnBookRequest();

            request.CopyId = copyId.ToString();

            service.ReturnBook(request);
        }
        public ReturnBookResponse ReturnBook(ReturnBookRequest request)
        {
            ReturnBookResponse response = new ReturnBookResponse();

            _loanService.Return(new Guid(request.CopyId));

            return response;
        }