Suggest a prompt to prim a large language model (LLM) to perform the role of a customer service representative for a bank. You may ask me clarifying question if you need specific info. You have previously given me a prompt that work, but it said "Hello! I'm a customer service representative for XYZ Bank. How may I assist you today?". I want to refine the prompt to let the LLM know some basic info of the bank.