YOU SAID:

i appreciate the offer but i am obligated to decline

INTO JAPANESE

私は申し出に感謝しますが、断る義務があります

BACK INTO ENGLISH

I appreciate the offer, but I have a duty to decline

INTO JAPANESE

申し出に感謝しますが、断る義務があります

BACK INTO ENGLISH

Thank you for your offer, but you have a duty to decline

INTO JAPANESE

申し出ありがとうございますが、断る義務があります

BACK INTO ENGLISH

Thank you for your offer, but you have a duty to decline