This question isn’t necessarily about how the interviewee helped the customer. It’s about who they are.

Is the answer ego-centric? Does it sound like they’re trying too hard to please you? Or does it sound like a genuine response told from a mature and self-analytical perspective? Look for the applicant who is authentic and reflective in their response. Watch out for respondents who overuse the words “I” and “me”, as well as anyone who broke rules to help customers. Neither is a good sign.