This may sound like the most obvious tip in the world, but you would be surprised how often people get it wrong.
Be On Time
When you tell someone that you will meet them at a specific time, they are counting on you to be there. They take you at your word. They give you theirs. They may have gone to great lengths to be there and if you don’t arrive on time it shows lack of consideration for their time and you have not kept your word.
If you are even one minute later than you agreed – you have broken your word. People will remember.