As long as you cancel 24 hours ahead, there's no charge. From the
DCL website:
When Guests have not cancelled a dining reservation at Palo at least 24 hours prior to the reservation or do not arrive at the restaurant to honor their reservation, the reservation is considered confirmed and 100% of the per person cost is applied to the Guests' folio.
and
Cancellations
When Guests have not canceled a dining reservation at Remy at least 24 hours prior to the reservation or do not arrive at the restaurant to honor the reservation, the reservation is considered confirmed and 100% of the per person cost is applied to the Guests' folio.