Lush Sales Assistant interview questions

The group interview was a lot of fun and was about different activites and tasks to do on your own (present to the group) or together (build the highest tower possible out of paper. I made it to the trial shift which was a terrible experience. They let you go on your own and expect you to sell products without necessarily knowing what you're talking about. I kept being asked questions about gift boxes contents and had to refer back to the managers and ask them and they told me I should be more independent but how can I accurately recommend a gift box when I know as much as the customer about their content? I did plenty of homework and I knew about the products specifically (and I have been a LUSH fan for a long time) but it really stumped me.