Booking notification - allow condition for no deposit

We have the option for Deposit exists, but we would like to put a cancellation link and this would only work if we can only show this to those with no deposit paid.

The promo option would not work, as they change all the time. Number of guests is not suitable as the deposit required is not linked to numbers of people, rather the number of people varies depending on the day.

Unless the cancellation link would also refund the deposit (within a timeframe), this is the only way to ensure this works effectively.