Explain that you have experience in running a cash register y that you are a quick learner so if the machines they use may be different one of you best skill is that you learn quickly while on the job be certain that you also wrote down any experience that you have had working as a cashier shift lead or manager. Stay calm and professional.

On your resume put all places you worked as a cashier and the different duties given while working the register. They want to know if you can multitask while working the register.

Maintain your customer service, by keeping your conversations with customer's understandable, and short.