@Kathryn141 Go to the guest's profile by clicking on their picture. You will see all of their reviews, positive and negative.
It's pretty common for people to have few or no reviews, even if they have been members for a while. It took me a while to book my first trip through Airbnb, and my usage as a guest has been spotty because it doesn't always work with the type of travel I do.
A red flag for me would be if they mentioned they had taken lots of trips through Airbnb but there were no reviews, because some hosts don't review if the guest is bad. Otherwise, if you're still concerned, just ask them about it.