s:can I help you?
u:I want a pen please.
s:What color do you want?
u:Blue.
S:How about this one?
U:Nice.How much is it?
S:12 dollars.
u:It's great.I'll take it.
S:Here you are.
s:can I help you?
u:I want a pen please.
s:What color do you want?
u:Blue.
S:How about this one?
U:Nice.How much is it?
S:12 dollars.
u:It's great.I'll take it.
S:Here you are.