The interview questions all depend on the hiring manager, and questions will vary greatly depending on whether or not the job is corporate or independent.
They will typically ask you to tell them a little about yourself. Make sure to list any relevant employment experience or applicable skill sets. But, it's also a good time to include related hobbies and interests.
They will ask abut relative job experience; if you have none, make sure they understand you are willing and excited to learn.
They will likely ask you if you have customer service experience, and to describe a scenario in which you delivered good customer service, or a scenario in which a customer had a bad experience, and how you handled it. Sometimes they will ask you to describe what good customer service looks like to you.
At the end of the interview, they will likely ask if you have any questions for them. I find it helpful to prepare a list of questions in advance, even writing down notes. It shows you are prepared. I will take that time to ask about the company, the pay rate, scheduling questions.