这句话怎么说更好

I'm so sorry that i will leave home for Xi'an for four days.简单即是最好的.

i have to leave home to XiAn for 4-days, sorry for any inconviences.

I'm so sorry for leaving home to Xi'an for four days.

I'm sorry but I'll go to Xi'an for 4 days.

非常抱歉，我将离家去西安四天。