A：Can I help you?
B:Yes,please.I want to buy a book for my son.
A:Sure.Would you like this one?It is a about math's book.
B:No,thanks.I want a Chinses book,do you have one?
A:Yeah,look at here.It is a very interesting Chinses book.
B:Great!I'll take it!How much is it?
A:10 dollors,please.
B:That's right,here you are.
A:Thanks.Bye!
B:See you!