This question is easy for people who have worked in a bank. All they have to do is naming the place, time, and the job title they had in the bank.
However, what to do if you have no prior experience? You can mention related roles (customer service, sales, retail, etc) that helped you to prepare for the role of a teller.
And if you have nothing else to offer, you can mention the “experience” you have from “the other side of the table”, the experience you gained as a client of a bank. Clients can observe what the tellers do and how they act, and it should help them to understand the role of a teller.
I have worked as a teller at Wells Fargo for two years. I really liked my job, but they closed our banking center. I would like to continue my career in the same field, that is why I apply here.
I have never worked in a bank before. However, I have worked as a customer assistant in a retail store for the past two years, and I gained good cash handling experience. I have also improved my communication skills while doing the job.
I have never worked in a bank and this is actually the first job I try to get. But I visit Bank of America quite often, becasue I have a checking account with you. Watching the tellers in their job, I believe I know what is expected from a good one.
Special tip: You should always adapt your answer to the situation you face. Everything has a bright side, you just need to show it to the employer. Job seekers with no working experience are not necessarily worse than people who have worked in a bank before. Show them that you are motivated, eager to learn, and ready to become a great teller.