在英文中，你可以使用以下話術來回訪老客戶：

1. Hello [Customer's Name], how can I assist you today? We hope you are doing well.
2. Thank you for your loyalty. How can I support you in the future?
3. It's been a while since we last spoke, how have you been?
4. We noticed that you haven't placed an order recently. Is there anything we can help you with?
5. We value our long-term customers and would love to hear from you again soon.
6. We miss hearing from you and would like to know if there is anything new or special you need.
7. We are sorry to hear that you haven't placed an order recently. Is there anything specific that we can assist you with?
8. We appreciate your continued support and would love to hear from you again soon.
9. We hope you are doing well and would like to know if there is anything we can assist you with.
10. We are sorry to hear that you haven't placed an order recently. Is there anything specific that we can assist you with?