Do NOT cancel the guest coming on the weekend of the 23rd:
you will incure penalties, either $50.00 or $100 will be subtracted by Airbnb from your next pay out, and your calendar will remain blocked, the automated review on your place, like: " host cancelled.." is not good to have right off the bat, and also super host status will be further away from you than before.
Next time guests want tentative favors: you could block out those days on your calendar so nobody else can book them, and then, when your guests decide one way or another, unblock those days so that they can alter their reservation. If they don't want it then, it would be open to other potential guests.
But best is always for guests to book, maybe later change their booking: but they need to commit, or you are easily getting short changed in the process.
As it is: you can not expect the potential guest coming on the 23rd to do you a favor and cancel himself (and incur fees for that..) . Even if he agrees and you agree to refund him those fees, it's just a headache - and it's not professional!
Before thinking of becoming super host (really, it's no big deal, it happens automatically once you fulfill certain, rather easy to reach requirements..), please familiarize yourself thoroughly with the rules and regulations of Airbnb. You are now running a business, and you need to know the ins and outs.
In this forum, you can follow what other hosts are dealing with, a great way to learn about what to do, and what not to do.
Good luck!