I am confused as to how to write a simple chat gpt api call. Am i supposed to use execute code step or AI Assist step. Are they supposed to be used together. Write now I am currently trying to setup a single step to call Chat gpt with a "what color is the sky" and store the result in a string variable. It seems there are no examples to the chat-gpt api itself, even though you are using chat gpt for help in developing every other step. It feels like I am missing something?