Where does this conversation take place?

W: What can I do for you?
M: I want to buy some stamps. How much is a stamp?
W: Twenty cents.
M: I also want some envelopes.
W: How many do you want?
M: Ten stamps and four envelopes.
W: Ten stamps and four envelopes. $ 2.20 in all. Anything else?
M: No, thanks. Here is the money.
W: Here are your stamps and envelopes.
M: Thank you.