YOU SAID:
hi sir, can i have a slice of pizza?
INTO JAPANESE
こんにちは、ピザを一枚いただけますか?
BACK INTO ENGLISH
Hello, could you give me a pizza?
INTO JAPANESE
こんにちは、ピザをください。
BACK INTO ENGLISH
Hello, please give me a pizza.
INTO JAPANESE
こんにちは、ピザをください。
BACK INTO ENGLISH
Hello, please give me a pizza.
That didn't even make that much sense in English.