if (slackUser != null)
            {
                _logger.Debug("SendSickLeaveMessageToUserIncomingWebhookAsync user slack name : " + slackUser.Name);
                var incomingWebHook = await _incomingWebHook.FirstOrDefaultAsync(x => x.UserId == slackUser.UserId);
                var slashIncomingWebhookText = new SlashIncomingWebhook() { Channel = _stringConstant.AtTheRate + slackUser.Name, Username = _stringConstant.LeaveBot, Attachments = attachment };