Listen to the whole passage
Listen to the whole passage once first, then practice sentence by sentence.
The first line is the other person opening the conversation; the "You" lines are suggestions for you to practice saying in this scenario (not a back-and-forth dialogue).
A clothing store salesperson
你好，你想买什么？
Hello, what would you like to buy?
You
我想买衣服。
I want to buy some clothes.
You
这件衣服很漂亮。
This piece of clothing is very pretty.
You
这件衣服多少钱？
How much is this piece of clothing?
You
这个太大了。
This one is too big.
You
有小的吗？
Do you have a smaller size?
You
太贵了。
That's too expensive.
You
我买这个，谢谢。
I'll buy this one, thank you.