add message box and rename the same sheet for all of closed files in the folder

Hi experts ,
here is code will pull all of data from all of files are existed in the same folder for sheet name is MATCH , so if there files don't contain MATCH sheet then will shows error subscript out of range in this line

With .Sheets("MATCH")

. so what I want show message box" the sheet is not existed, do you want rename all of sheets in all closed file to MATCH sheet" and contains two choices if press ok , then will rename to MATCH sheet and pull data , if I press no then will just pull data for just files contains MATCH sheet.
last thing when rename sheet to MATCH sheet for closed files should search for the first sheet to rename to MATCH sheet and ignore the others files contain MATCH sheet .

Sub CopyRangeFromSetFolder()

Dim desWS As Worksheet, wb As Workbook, lRow As Long
Dim wbNm As String, Fld As String

Application.ScreenUpdating = False

Set desWS = ThisWorkbook.Sheets("Sheet1")
desWS.Range("A2").CurrentRegion.Offset(1, 0).ClearContents
' define path to set folder, ending in \
Fld = ThisWorkbook.Path & "\"
'get first file with wildcard match
    wbNm = Dir(Fld & "*.xls*", vbNormal)
    ' loop while there's another matching file
    Do While wbNm <> ""
       ' Check it's not this workbook
        If wbNm <> ThisWorkbook.Name Then
            With GetObject(Fld & wbNm)
                With .Sheets("MATCH")
                    lRow = .Cells.Find("*", SearchOrder:=xlByRows, SearchDirection:=xlPrevious).Row
                    .Range("A2:D" & lRow).Copy
                    desWS.Cells(desWS.Rows.Count, "A").End(xlUp).Offset(1).PasteSpecial xlPasteValues
                End With
                ' close the file without saving
                Application.DisplayAlerts = False
                .Close False
                Application.DisplayAlerts = True
            End With
            Else
            MsgBox "File Elmarghanie Brand .xlsm not found"
     Exit Sub
        End If

        ' get next matching file
        wbNm = Dir()
    Loop

Application.ScreenUpdating = True
End Sub

I hope somebody has idea to do that
thanks