someone who serves customers in a shop/store/restaurant. You sometimes need their help
shop assistant /ˈʃɑːp əˌsɪs.tənt/ or salesclerk /ˈseɪlz.klɝːk/ . Waiter /ˈweɪ.t̬ɚ/: nhân viên phục vụ, nhân viên bồi bàn
a person whose job is to receive and pay out money in a shop, bank, restaurant
cashier /kæʃˈɪr/ (n ): ng thu ngân
a room in a shop where you can try clothes on to check that they fit before you buy them
fitting room /ˈfɪt̬.ɪŋ ˌruːm/ (n ): phòng thử đồ