@Parker46 I agree that your post is confusing. First of all, as Emiel said, guests can't enter dates on a booking request that show as unavailable on your calendar. So these guests are sending requests which have those dates showing?
Or are these inquiries, not requests, with the guest just asking for certain dates and telling you they see them as available?
And how are you receiving these messages if they aren't in your inbox? This makes no sense.
I see you are a new host, so maybe you don't understand how requests and inquiries work, or the difference between them?