Hey...
I just did this lesson as my open class. We kind of just used the idea from the book and expanded in our own direction. Pretty much is was about 25 minutes of lecture. Then we used the conversation, which you will have to prepare. We printed them out, cut them up, mixed them up and gave each conversation to a group. They had to put the conversations in order. You could do this 6 different times if you like, just rotating the conversations around until each team does each conversation but we only rotated them twice and then had each group prepare and present their conversation to the class. It was pretty interesting and informative. You could easily attach it to the conversations in the book if you like.
I hope you can use it!