First-time only promo codes cannnot be entered once a reservation has already been made. 

Your promo code can't be applied an already existing reservation.

If you forgot to use your promo-code, please enter your promo-code first from the menu screen, and then create a new reservation. After that, please cancel your original reservation.
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If you cannot cancel your reservation because it is the reservation date or you have a first time only promo code, please contact support for further help.