Hello @Olga1382
This type of inquiry is typically someone who is looking to contact you to book directly so as to avoid the Airbnb fees. They know exactly what they are doing and are scammers and target new hosts.
If you do contact them you are going against the terms and conditions that you agreed to. I had a few of these when I first began on Airbnb and I would flag these guests. You'll see three dots ... on the conversation thread of the message system
It's only an enquiry so all you need to do is send them a message back but within 24 hours to maintain your response time saying that your calendar is up to date and the availability is shown and you only use the Airbnb message system.
You will see that they will disappear when they read this - they realise that you're not naive😉
If you want more information on how to handle enquiries, read the link below:
https://community.withairbnb.com/t5/Community-Guides/GUIDE-Handling-Enquiries-and-Bookings/td-p/1895...
Good luck with hosting,
Joëlle