That's the answer many Blacks received when trying to get rooms at large and small hotels back in the days when such discrimination was rampant. It didn't get very far then and won't now either. The difference of course is that racial discrimination is prohibited as it well should be (won't get far claiming a religious reason for such discrimination; even Mormons gave it up) whereas there are well-known biblical prohibitions on homosexual activity.
I should add that responding to a same-sex ceremony that way (booked for the day) after being told it is a homosexual union is just baiting the gay/lesbian zealots. They easily can call later to book a traditional marriage and get scheduled. Then you are trapped in a lie and their next stop is the lib-created Human Rights Commission.