"The Pigman" by Paul Zindel is an interesting book, because a lot of the time two different chapters are relating the same events. That's because one chapter will be told by John, and the next chapter will be told by Lorraine. Chapters 3 and 4 are this way. They are both focused on the "phone marathon" game that John and Lorraine like to play. The game is simple. Call a random phone number, and keep the person talking as long as you can. Lorraine cheats a bit and intentionally calls Mr. Pignati.
On a very surface level, a conflict is simply keeping a person on the phone. It can't be easy all of the time. But the main conflict of the story is an internal conflict for Lorraine. As she speaks with Mr. Pignati, she begins to sense his loneliness. Lorraine starts to feel guilty for making the phone call and lying to him.
There was something about his voice that made me feel sorry for him, and I began to wish I had never bothered him.
She feels especially guilty when she convinces him to donate 10 dollars to a fake charity.