conversation practice(At the bookstore)

At the bookstore.(S:salesclerk；C:customer)
C：Excuse me.Do you have a tail two cities?
S：Who is author?
C：Charles Dickens.
S：Sorry. We are sold out right now.Please come back next week.
C：Ok.thanks!


C：How do you have a good English-Chinese dictionary?
S：Sure! How about this one?
C：Is this the lastest edition?
S：Yes.We have both the paperback and the hardcover.
C：What's the difference?
S：The hardcover is more expensive.
C：Ah,I see.I have the paperback.