@Lynda4
No, that's not how cancellation works. If you, as a host, cancel any confirmed reservation, you get penalized in search rankings and probably lose whatever fees Airbnb has collected, though I'm not sure because I haven't canceled.
You're confusing the cancellation policy for hosts and guests. Hosts always get penalized for any cancellation of a confirmed reservation. Guests can cancel, minus the Airbnb fees, depending on the host's settings. (Strict, moderate, flexible.)
To permanently solve your problem, make sure you set your calendar to ONLY accept reservations three months out. See here for how to do that: