@Ann-Maree0
First thing to do is look at your calender - are the dates blocked out with a green line and a photo of the guest? If so, this means it is a confirmed booking - if not, then no booking has been made.
Second go to Your Reservations: Can you see the booking with Accepted in Green in the Status column. If so, it's a confirmed booking.
If both of the above are true then you may find the email from AirBnB in your Junk folder.
If neither are true then your guest has not booked and you should tell them to contact AirBnB as you do not have a confirmed booking for them.