在餐廳問人個位有冇人坐，英文應該點講?

在餐廳問人個位有冇人坐 :
A : Excuse me , is this seat taken by some one ?
如果有人，對方應該答 :
B : Oh, yes. Some one will come later / Oh, yes. He just went out for a second

如果冇人坐，對方應該答 :
B : Oh, no. You can have it.

通常英文會是問:我可不可以坐底?

問:May I sit down?/ Could I sit here?
如果冇人坐，對方會答: Yes/ Sure.
如果有人，對方會答:Sorry,my friend is coming./ No, it is occupied.