Do what you say you are going to do; learn to under-promise and over-deliver. Be honest with other people, and be honest with yourself. There are  lot of things you would probably like to do, and at least that many things, if not more, that you are already committed to. Telling someone what they want to hear may bring immediate good feelings to both of you, but at what cost? You may end up stuck in a situation where you either end up running yourself ragged to meet the commitment, or simply are not able to meet the commitment. This is not good for either of you. Understand that there are times in your life where you just can’t take on additional tasks. It is better to say no, than to say yes and not meet the commitment.