@Belinda141 was the booking made through instant book? if you want more control over who books your property you can deactivate this setting and screen your potential guests, they will have to make an inquiry to book your property and through the dialogue you can decide whether you accept or decline their request. You can also add conditions to who can instant book, i.e. ID verified only.
I don't know that there is such a thing as a 'fake booking', as you have to actually pay airbnb to complete the booking process, there is no real reason for anyone to do this unless then plan to stay at your place. Also, there is no obligation to correspond with the host if the booking is made through instant book, clearly they are new to airbnb (no reviews) they may simply be unaware of how it all works. I wouldn't cancel the booking, as there is usually a penalty attached. There is still a week before the guests arrival, and they might just be late at responding.