Please check this

excelSheetConvert.php

<?php
  use Maatwebsite\Excel\Excel;
  use Carbon\Carbon;
  use App\Model\BokkingsModel;


  class SomeController extends Controller{
    /**
       * Export to Excel data sheet
       *
       * @return \Maatwebsite\Excel\Excel
       * */
      public function excel(Excel $excel){
          $carbon = Carbon::now();
  
  
          $doc  = $excel->create('Bookings-Excel-Sheet'.$carbon , function($excel){
                  $excel->sheet('Bookings-excel-sheet' , function($sheet){
  
                     $bookings = BookingsModel::all();
                     $sheet->loadView('admin/bookings/partials/bookings-part',['bookings' => $bookings ]);
                  });
          });
  
  
          return $doc;
      }
  }