@Laura2592 I had a guest who wasn't answering any of my messages and it was getting on to just a few days before her booking date (she had booked a month and a half ahead). She lived in Lebanon, so I couldn't call her. I asked Airbnb to get in touch with her, and they also were unsuccessful for 2 full days. Finally on the 3rd day, a day before she was due to arrive, she messaged me, profusely apologizing, saying she'd had a close family member die and her travel plans, and her Airbnb bookings were quite far from her mind. She hadn't been checking her email, text messages, or Airbnb messages.
At that point, she cancelled, got a 50% refund according to my moderate policy, but she never requested any further refund, and if I hadn't pursued trying to get in touch with her, she likely would just never have shown up with no communication and without having cancelled.
It could be anything- I'd just forget about it. Not all guests demand refunds when they can't make it- some people actually don't make their own problems someone else's, believe it or not.