@Caroline498, you've stumbled into the one major sin of a host...never cancel a reservation! It seems you're a new host, and you might try throwing yourself on the mercies of Airbnb, and asking them to unblock those dates. Meanwhile I suggest you read some of the threads on this forum to get a better idea of what is involved in hosting, so that you don't find further trouble along the way. You don't describe what the pricing error is, but that's one of the most common sources of problems, that people haven't stated their prices properly and then are surprised when a guest books at a ridiculously low price. The solution to that is to call Airbnb, but not to cancel the reservation.
Take heart, there's a lot to learn, but there's a very helpful group of hosts on this forum, so if you have any questions in the future, just jot them down here and you'll get lots of helpful feedback from other hosts! Best wishes, Susie