When I see "available now" and I don't get a response, I don't get upset, but I think it is in poor form. There is no obligation the person gets back to me. I wish the sites had an "available today" message in addition to "available now". (People also don't turn it off when they are not available anymore). I literally think "available now" means, available in the next two hours, but that is not how many people view that message. I get upset when I book an appointment, am waiting outside the person's apartment, then they cancel, like what happened to me yesterday. I also don't like to schedule too far in advance because of the number of cancellations I have experienced for various reasons, which all amount to, someone or something better came along...One masseur in NY does use a Square calendar that lets you schedule appointments. He still has to approve the appointment, but at least I know when he is not available for sure.