@Monica4 , I would think you are okay: you declined the artificial request, your calender is NoT blocked out for those dates, only you have that weird wording , "confirmed for May" on your message thread. Can you attach a screenshot if it here? does it show the same for your guest?
I would call the guest and talk to them, both parties have the phone numbers now. Sure sounds like one of those weird Airbnb glitches, perhaps it is all gone by tomorrow...
You could also give us here those artificial May dates and we can double check for you and verify to you that those dates are open and are NOT booked.
yes, those Airbnb glitches keep us on our toes..... so we learn to just adjust to them and do our own detective work before calling them. good luck, hope it gets cleared up soon.
Btw: in "community help", the first post is an extensive guide on how to contact Airbnb