Problem with time slots being green when not enough spots available

I've noticed that if a guest selects that they will be a company of four people and then starts looking for time slots, all spots will be green that are not enitrely booked up. Even if there is only one spot available at a certain time, it will be green.
Please have a look at the attached picture for clarification. Can this be changed so that the time slots show up grey instead when the chosen number of guests are more than the available spots? Or could it, at the very least, be made so that it says how many spots are still availbable at each time slot?

Please have a look at what I mean here:
And feel free to try it for yourself here:
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