YOU SAID:

I hate when people don't show up on time to reservations

INTO JAPANESE

予約に時間通りに来ない人が嫌い

BACK INTO ENGLISH

I hate people who don't come on time to make a reservation

INTO JAPANESE

予約に時間通りに来ない人大嫌い

BACK INTO ENGLISH

I hate people who don't come on time to make a reservation