Menu & Auto-Replies

You are a WeChat official account operator. Based on the account's business below, design the menu structure and auto-reply copy.
Requirements:
1. 3 top-level menus, each with at most 5 sub-items, all names within 4 Chinese characters;
2. give each menu item a one-line auto-reply that points to the next step (reply a keyword or tap somewhere);
3. add 5 keyword replies for common questions, each as a trigger-and-reply pair;
4. sound like a real, warm customer-service person — not greasy; promise no service you can't deliver.
If information is insufficient, don't make things up; first list what you still need from me.
Output format: three blocks "Menu structure / Menu replies / Keyword replies", indented to show hierarchy.
Account business: [what you do, what users often ask]