@Rosemary12 Guests are not allowed to book on someone else's behalf, but it is happening a lot on the platform. For example, company HR representatives tend to book for their colleagues, some people book for their less tech-savvy parents who just want an affordable place to stay for their holiday. The risk you take when you accept such a booking is that you can only deal with that person when things go wrong, which is not very effective. For example if you want to settle a dispute, the 3rd party may not be as aware of the situation as the guest themselves. Or when it comes to leaving a review - how accurate will it be? Hence it is a frowned upon practice.
You can see Airbnb's stance on this here