Bonjour @Marie-Lyse0 et bienvenue dans la communauté !
You are actually on the French board so I should be answering you in French, but seeing as you have posted in English I'll make an effort, in case you don't speak French and just posted your question in the wrong board...
Depending on how the host had set his booking settings, some listing would be booked "instantly" instead of passing by a "contact the host" step, so to speak, which is what you wre looking for if I understood you correctly. In that case, I would advise you to contact Airbnb directly and explain your situation with the maximum details you have on hand.
J'espère que vous trouverez une solution rapidement !