How to continue accepting new booking requests for certain time blocks only, but still allow current/repeat clients to book at their regular times in the "unavailable" time block?

Hi, so Rover allows walkers set their available times of day in morning, afternoon-ish, and evening increments. If I'm essentially fully booked with repeat clients for one of those time blocks, but would still like to accept requests for other times of day, how might that work? I understand we have the ability to broadly change our time-of-day-availability settings, but if I were to remove availability for one block of time, would repeat clients still be able to easily rebook their usual walks within that block each week? (There is also the option to only accept repeat clients, of course, but I imagine that would prevent new requests that would be compatible with my available blocks of time, which I'd like to avoid).

Thanks!