I'm sorry but

Excuse me. Do you have a table for two?
I'm sorry, (but) there aren't any seats now.

为什么用BUT
为什么要转折额

PS:不小心发错类型了。。。
大家将就着看一下。。

I'm sorry,but I'm sorry but i'm sorry 和sorry的区别 baby i'm sorry的歌词 I'm sorry有几种意思 I'm sorry to trouble you. ----Would you please__here? ---I'm sorry. I'm sorry.的回答 英文I'm sorry.回答有几种呢？ 顺子的i'm sorry ,中文翻译