Final answer:
Acknowledge the customer's knowledge and leverage it to assist them effectively.
Step-by-step explanation:
When interacting with a customer who has high product knowledge, it is important to acknowledge their knowledge and leverage it to assist them effectively. By acknowledging their knowledge, you show respect and appreciation for their expertise. You can build rapport by asking open-ended questions to understand their specific needs and preferences. Then, use their knowledge as a starting point to provide more detailed and advanced information or recommendations that align with their interests.