@Christine637 An inquiry and a request are two different things.
The inquiry is when the guests ask questions about your rental. All you have to do is answer their questions within 24 hours.
A request, which it sounds like what you have since the dates are marked off on your calendar by airbnb, gives you 24 hours to either pre-approve or decline the request. This allows you time to communicate with the prospective guest via the airbnb platform to assess whether this guest would be the right fit for you. Then you decide whether you want to pre-approve or decline the request. If you decline, there will be a pop-up box asking the reason. I think, but don’t quote me on this, you have 3 free cancellations a year. But the cancellation policy recently changed so I’m not 100% sure. If you decide to pre-approve the prospective guest, then the guest has 24 hours to pay.