@Leonardo400 Guests don't transfer money to an account. Your guest needs to have a payment method set-up on their profile and then they just fill in the booking form, stating the correct number of guests and the amount they will be charged will show up there and Airbnb will take care of charging them. The host doesn't deal with the payments at all.
I really think you need to read up on the Airbnb site about how everything works. And if the guest has a problem with booking, they need to contact Airbnb to help with it, not the host.