YOU SAID:

I want to use the toilet if you don't mind

INTO JAPANESE

よろしければトイレを利用したい

BACK INTO ENGLISH

I'd like to use the bathroom if you'd like.

INTO JAPANESE

もしよろしければ、トイレを利用したいです。

BACK INTO ENGLISH

If you don't mind, I'd like to use the toilet.

INTO JAPANESE

もしよろしければ、トイレを使わせていただきたいです。

BACK INTO ENGLISH

If you don't mind, I'd like to use the toilet.