Interview skills?

Anyone know how to build them? I am interviewing and have trouble answering questions similar to, "Tell me a time when..." for retail jobs. I don't exactly remember everything, especially when I went out of my way for the customer. I just did my job and went home. I really never did anything spectacular.

Basically, I need help/assistance on building answers to questions for job interviews for retail positions. I'm not use to this. I worked for 11 years at a supermarket part-time, and left due to COVID. Anyone here have advice on how to navigate basic questions for retail positions? Thanks.

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