Apology for Delay

Hi {{customer_name}}, I am writing to sincerely apologize for the delay in resolving your request regarding {{issue_topic}}. We take pride in our service levels, and unfortunately, we fell short in this instance due to {{reason_optional}}. Our team is now prioritizing your case, and we expect to have a resolution for you by {{expected_time}}. Thank you for your patience and understanding. Best regards, {{your_name}}