Send personalized hotel pre-arrival messages using OpenAI, Google Sheets and Slack

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Description This workflow automates a personalized pre-arrival guest experience for hotels by combining Google Sheets, OpenAI, Email, and Slack. It detects upcoming check-ins, maintains unified guest profiles for new and returning guests, and sends warm, AI-generated welcome messages exactly 2 days before arrival, ensuring a premium, consistent experience without manual effort. ⚠️ Deployment Disclaimer This workflow is intended for self-hosted n8n instances. ⚙️ What This Workflow Does (Step-b