YOU SAID:
i would like a cake please
INTO JAPANESE
私はケーキをしたいです
BACK INTO ENGLISH
I would like to have a cake
INTO JAPANESE
私はケーキを持っていたい
BACK INTO ENGLISH
I want to have a cake
INTO JAPANESE
私はケーキを持っていたい
BACK INTO ENGLISH
I want to have a cake
That didn't even make that much sense in English.