Just my feeling, but if you get through the initial interview and progress onto a group environment with your fellow applicants, you should expect rather a lot of role playing exercises due to this being a customer facing position. Essential to display a cheerful and amiable disposition, a willingness and patience to listen to what the "customer" is asking/complaining about, visible empathy with a (complaining) customer and a cheerful willingness to do everything in your power to resolve the issue. Remember that what may seem like a stupid/inane question to you is not seen as anything other than a genuine enquiry by the person asking.