Contact your client in whatever way you think is appropriate given that client's quirks. After setting the stage for your communication, explain how your client might use a transaction processing system, a business support system, and a user productivity system. For each type of system, provide a specific example, and explain how the system might benefit the organization. Also, prepare an organization chart for your client, demonstrating that you understand the Bacchus structure.
Remember to stay in role! This is a business communication situation, not an academic one.