I'm sorry for not being more helpful
I apologize for not being more helpful. I understand that you were counting on me, and I regret not meeting your expectations. I want to express my sincere apologies for any inconvenience or disappointment I may have caused.
I realize that my actions, or lack thereof, have let you down. I want you to know that I genuinely regret not being able to provide the assistance you needed. I understand the frustration and inconvenience this may have caused you, and I am truly sorry.
I want to assure you that I never intended to be unhelpful. Sometimes, circumstances beyond my control may have hindered my ability to provide the support you were seeking. However, I acknowledge that it is my responsibility to communicate any limitations or difficulties I may encounter, and I apologize for not doing so.
I understand that you may feel let down or frustrated by my lack of assistance. Please know that I value your trust and I am committed to making things right. I will take this as a learning opportunity to improve myself and ensure that I am better equipped to help you in the future.
If there is anything specific that I can do now to rectify the situation, please let me know. I am open to any suggestions or feedback you may have. Your satisfaction is important to me, and I want to make amends for my shortcomings.
Once again, I apologize for not being more helpful. I genuinely regret any inconvenience or disappointment I may have caused you. I hope you can find it in your heart to forgive me and give me another chance to assist you in the future. Thank you for your understanding and patience.