Update 2 Tables In One Sp

I want to update 2 tables in one sp as the parameters are the same. Here's my sp and I don't get any syntax errors in Ent manager, but the error 'Incorrect syntax near 'spRB_CancelFacMenuBooking' when I run it.

CREATE PROCEDURE spRB_CancelFacMenuBooking

@strBookingNo integer,
@strCancelled bit,
@strCancelledDate datetime,
@strCancelledBy nvarchar(100)


AS
BEGIN
UPDATE tblRB_FacilitiesBookings SET
FB_Cancelled =@strCancelled,
FB_CancelledDate=@strCancelledDate,
FB_CancelledBy=@strCancelledBy
WHERE FB_BookingNo = @strBookingNo
END

BEGIN
UPDATE tblRB_MenuBookings SET
MB_Cancelled =@strCancelled,
MB_CancelledDate=@strCancelledDate,
MB_CancelledBy=@strCancelledBy
WHERE MB_BookingNo = @strBookingNo
END
GO