Come prepared with a few examples where you have provided excellent customer support and be prepared to give them to the interviewer. Almost all interviewers will ask a form of this question throughout your interview. They may even ask this question in multiple ways, so it's good to have a few examples to provide for the interviewer.

Here is an interview answer example: "A customer had called, asking about one of our products. After I described the product to her, I then proceeded to locate a store nearest to her location. I checked if there was stock available and let her know who to look for at the store. The customer thanked me gladly for going the extra mile for her convenience."