-hello, may i help you?
-im looking for a jumper.
-what size are you?
-im a medium.
-how about this one?
-that's nice. may i try it on?
-yes, the changing rooms are over there.

-thank you

-does it fit okay?
-yes, its perfect. i'll take it.
-how would you like to pay?
-i'd like to pay by credit card