How do you make ChatGPT reliably follow instructions and reference files over long conversations?

Overview

I've been trying to use ChatGPT as an itinerary planner, but I keep running into two major problems. Problem 1: It stops following instructions I provide an operating manual with rules like: Use these documents as the authoritative source. Never make assumptions if a source isn't available. Follow specific formatting and categorization rules. Prioritize my instructions over default behavior. It works well for the first few messages, then gradually starts reverting to default behavior. It

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