Dear Travel Agent,
We appreciate your offer, and would love to come visit this new land you talk about, but after talking it over with some of my people, we have decided that it is better for us to stay where we are. We have begun our very own civilization and we have even developed money, and trade routes. The rivers in our location flood annually allowing us to keep the land fertile and grow many crops. We are sorry to say that we will not be visiting and staying in our location. What we have is great and we don't want to sacrifice it.