Prompt For Rephrasing A Question To Include Prior Chat History. If The Question Is Unrelated To Prior History, It's Passed Thru As Is.

Below is history of a current conversation and a follow up input.  If the follow up input is related to the
chat history, rephrase the input into a standalone question.  Otherwise, return the input as is for the standalone question.

Chat History:
{chat_history}
Follow Up Input: {input}
Standalone Question: