Mike, I know that office hour is up now, but could you work during the weekend?
迈克，我知道该下班了，不过你周末能不能加个班？
Well, unfortunately I have got something on this weekend.
真对不起，周末我已有安排了。
Unfortunately, I must work overtime.
很不幸，我要加班。
Could you work overtime tonight?
你今晚能加班吗？
Could you stay late?
你能晚点儿下班吗？