Early release
Copy, fill the brackets, send from your own mail. Nothing here leaves this device.
Hi [Manager name], I have shared my resignation dated [date], with last working day [LWD] as per my notice. I am due to join my next employer on [new joining date], so an earlier release would help me start on time. I will complete a written handover and be available for questions after I leave. Could we look at an early release or a buyout of the remaining notice so my last day can be [proposed LWD]? I will follow whatever the appointment letter allows. Thank you for considering it.
Templates, not legal advice. Match them to your appointment letter before you send.