Can I help you?
Yes, I'd like to buy some headphones.
What sort of headphones would you like?
The ones of the best quality.
Will these suit you? They are very good.
How much are they?
180 pounds.
I'll take them.
So, that's 180 pounds, please.
Here you are.
OK. Here are your headphones and 20 pounds change.
Thank you, bye.
Good bye.