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 assistant
你好，你想买什么？
Hello, what would you like to buy?
You
你好，我想买衣服。
Hello, I'd like to buy some clothes.
You
这件衣服多少钱？
How much is this piece of clothing?
You
太贵了！
That's too expensive!
You
这件衣服很漂亮。
This piece of clothing is very pretty.
You
这个有点儿大。
This one is a bit big.
You
好，我买这件。
Okay, I'll buy this one.
You
给你钱，谢谢！
Here's the money, thank you!