Jonah 3 - Perhaps God will change his mind

What is Jonah's challenge for a prophetic-future focused Christian? 

There is a widespread idea of some prophecies being conditional on our response, and others being unconditional. The more we look at it in the Old Testament the more it seems this distinction is not often all that clear in the prophecy and its wording. We are intrigued by some of the implications for reading and applying prophecy today, especially as Adventists.