cashier / counter

cashier

a person whose job is to receive and pay out money in a bank, store, hotel, etc.


counter

a long flat surface over which goods are sold or business is done in a store, bank, etc.

I asked the woman behind the counter if they had any postcards.




http://oaadonline.oxfordlearnersdictionaries.com/dictionary/cashier
http://oaadonline.oxfordlearnersdictionaries.com/dictionary/counter