I'm very sorry (for the trouble); thank you very much; I'm honored
A humble set phrase used to express deep apology for causing inconvenience, sincere gratitude for a favor, or a feeling of being undeserving of kindness. Often used in formal situations, customer service, or when receiving a gift or special treatment.
I'm very sorry to bother you when you're busy, but could you spare me a moment?
Thank you very much for coming all this way; I'm truly grateful.
I'm deeply honored to receive such a wonderful gift.