IKEA Customer Assistant interview questions

So there are 3 stages to this. First of all there is a phone interview, mine lasted very brief and didn't seem to much dependant on weather you get invited to the assessment centre. The person asked me questions such as 'What do you no about ikea' and 'Tell me about yourself'. Then I got invited to the assement centre which I was very nervous for but Infact it was the easiest part. Very laid back and relaxed. Firstly we all sat in a circle and there was a bunch of products on the table, we had to pick one which resembles us and then each take it in turn to tell eachother about ourselfs, why we chose IKEA and why we picked the product. We then were put in groups and had to come up with a product and present it to the rest of the group. Finally we had to come up with 5 key concepts of customer service. They then said there will be brief individual interviews which were very relaxed. I then got a phone call a few days later to say I have been succesful and I would be invited for a 1-1 interview. This is were it gets hard. The questions they asked for me I found really difficult. They asked me what is one thing I changed in my previous roles business and name one time you worked well with another person and explain it. If you don't have much expirience like me, then it is hard to answer tough questions. I am awaiting a phone call but am not promising as to weather I will get the job as my interview was a disaster.