YOU SAID:
I would like a slice of pizza.
INTO JAPANESE
一切れのピザをお願いします。
BACK INTO ENGLISH
I'd like a piece of pizza.
INTO JAPANESE
ピザをお願いします。
BACK INTO ENGLISH
Pizza, please.
INTO JAPANESE
ピザをお願いします。
BACK INTO ENGLISH
Pizza, please.
That didn't even make that much sense in English.