Write a dialogue between a customer and a shop assistant, at least six turns.

Include: asking the price, asking for another size or colour, deciding, and paying.

Patterns: «Cái này bao nhiêu tiền ?», «Cho tôi...», «Có cỡ lớn hơn không ?».

Watch out: address the shop assistant with a kinship term plus ƠI — «Chị ơi», «Em ơi». There is no word like waiter or assistant used for calling someone.