Avoid: Anything more? / Any more?
Say: Would you like to get anything else?

Avoid: No more blue colour
Say: I'm sorry, we have run out of blue.

Avoid: Dirty is it? I ask my supervisor can give cheaper or not.
Say: Is it dirty? Let me ask my supervisor if we can sell it to you at a discount.

Avoid: If after you buy home, you cannot wear, you can return back to us.
Say: If you find the size of the dress/shirt unsuitable, you can bring it back for an exchange.

Avoid:  Pay money first. I wrap for you.
Say: I will wrap it for you after you have paid for it.