How can I help you? / May I help you?
Yes. I'm looking for a sweater.

Can I try it on?
Sure, the changing rooms are over there.

How much does it cost? / How much is it?
It's $45.

How would you like to pay?
By credit card.

Can I pay by credit card / check / debit card?
Certainly. We accept all major cards.

Have you got something bigger / smaller / lighter / etc.?
Certainly, we've got a smaller sizes as well.