我和您之前约定于这周五进行一次商务会谈，由于我们经理去北京出差了，周日

我和您之前约定于这周五进行一次商务会谈，由于我们经理去北京出差了，周日才能返回来，所以对此我表示道歉，请您对此表示原谅。

結果 (英文) 1:

Before you and I agreed on Friday to conduct a business meeting, our manager went to Beijing on business, on Sunday to return to, so I apologize, please forgive this.

結果 (英文) 2:

I agreed with you on this Friday before a business meeting, due to our manager on a business trip to Beijing on Sunday to return to this issue because I apologize, please forgive expressed.

結果 (英文) 3:

I have arranged a business meeting with you this Friday, because our manager went to Beijing on a business trip, we can return on Sunday, so I apologize for this, please forgive me.