I have the following piece of cod, which is designed to obtain a file name and then save the excel file with the name. It works great until the user hits cancel. It then over saves the current file with the name false or returns the debugger. I want it to simply end if the user hits cancel but cannot find a way to do that.

Code:
Sub SaveFile()
' If the locations of the cells containing the names changes please simply redefine the ranges attached to the variables
Sheets("Info & Readings").Select

UPSName = Range("A18")
MtnceType = Range("AB7") 'maintaince type, Major or minor
'Address:     'Broken up into Street number, street, city, and province
    StNumb = Range("J9")
    StName = Range("N9")
    City = Range("T9")
    Prov = Range("Y9")
MtnceWorkDate = Range("T4")

If (UPSName = 0) Or (MtnceType = 0) Or (MtnceWorkDate = 0) Then
        MsgBox ("Please fill in required fields first: UPS Identification Name, Mtnce. Type, Address, and Mtnce. Work Date. Thank You")
    Else
       If (StNumb = "") Or (StName = "") Or (City = "") Or (Prov = "") Then
            MsgBox ("Please fill in required fields first: UPS Identification Name, Mtnce. Type, Address, and Mtnce. Work Date. Thank You")
        Else
            NomFichier = UPSName & " " & MtnceType & " " & " " & StNumb & " " & StName & " " & City & " " & Prov & " " & Format(Range("T4").Value, " yyyy-mmm-dd") & " .xls"
            ActiveWorkbook.SaveAs Filename:=Application.GetSaveAsFilename(NomFichier, FileFilter:="Fichier (*.xls), *.xls")
        End If
    End If

End Sub