If you're replying to someone late, it's important to apologize for the delay and provide a brief explanation. Here's a template you can use: "Hi [Recipient's Name], I apologize for the delayed response. I had been [briefly explain the reason for your late response, e.g., caught up with work or personal commitments]. I hope this hasn't caused you any inconvenience. Now, regarding your [question or issue], [provide your response or help accordingly]. If you have any further questions, please don't hesitate to ask. I'll ensure a prompt response. Thank you for your understanding. Best regards, [Your Name]"