got the answer

def _track_template(self, changes):

        res = super(Contact, self)._track_template(changes)

        contact_stage = self[0]

        if 'stage_id' in changes and contact_stage.stage_id.mail_template_id:

            res['stage_id'] = (contact_stage.stage_id.mail_template_id, {

                'auto_delete_keep_log': False,

                'subtype_id': self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note'),

                'email_layout_xmlid': 'mail.mail_notification_light',

            })

        return res