I'll have the same.也给我来一份。
A: Tonight I'll get the lobster and steak dish.
今晚我要吃龙虾和牛排。
B: That sounds delicious. I'll have the same.
听起来味道不错，也给我来一份。

Make it I that two.来两份。
A: I'd like to have a salad with my meal.
我喜欢吃饭的时候来份沙拉。
B: Make it two, It's very healthy to eat salads.
来两份吧，沙拉对身体有好处。