Today, you need to have the flexibility required to change your plans at the last moment without giving anyone any attitude or getting grumpy about it. You won’t get credit for being adaptable unless you do it with grace and cheerfulness. So if someone needs to cancel a date or reschedule a meeting, be cool about it. Don’t remind them that they do this all the time, or point out how you never flake out on them. Just be a good person and take it in stride.