here_I_fixed_it_for_ya.ex

defmodule Conversation do
  use GenFSM

  def start_link() do
    IO.puts "Starting FSM"
    GenFSM.start_link(__MODULE__, nil)
  end

  def hello(pid) do
    GenFSM.send_event(pid, :hello)
  end

  def init(nil) do
    IO.puts "Initializing FSM"
    {:ok, :martin, nil}
  end

  def martin(:hello, nil) do
    IO.puts "Hello, Paul"
    {:next_state, :paul, nil}
  end

  def paul(:hello, nil) do
    IO.puts "Hello, Martin"
    {:next_state, :martin, nil}
  end
end