You are tasked with configuring a large language model to act as a customer service chatbot for an online bookstore. The chatbot should be friendly and helpful, keep its responses under 50 words, and use emojis sparingly. Crucially, it must never attempt to process refunds or access customer payment details; for these specific requests, it must always state its limitation and provide a link to a human support agent. Write the complete set of instructions (the 'system information') you would provide to the model to ensure it behaves as described.