请翻译成英文：在拜访客户之前,我会再次跟他们确认时间,具体的时间安排可能会有所变动

在拜访客户之前,我会再次跟他们确认时间,具体的时间安排可能会有所变动
Before I visit my clients (customers), I will again confirmed the time with them. Arrangement of the specific time might have to be altered (changed).
confirm = 确定
acknoledge = 承认、致谢、表明收到
concrete = 有形、实在
with their acknowledging time 语法不对