It was pretty simple actually. They gave me a free drink and asked me to wait for a while. Once our interview started it was basically conversational. There didn't seem to be any script and I myself asked a few questions. All in all a basic conversational interview. I would go in properly dressed. Not anything formal by any means but at least a clean shirt, clean shoes, and good pair of jeans. This may sound like common sense but I was surprised that some people didn't even follow this. The job isn't fancy by any means but you should still take it seriously. As long as you show enthusiasm and show respect for the job you should be ok.