Making Plans

You don't always need plans in life, but it's best to have some. Along with some sort of structure. It is good enough to make plans last minute, but you should refrain from backing out of plans last minute - especially if it could cancel the whole day. 

What I'm trying to say is, that when you make plans the majority of people stick to them. If you are friends with someone who usually backs out of these things, you should probably have a back up option. However if it is a usually reliable friend and they back out the day before, it usually leaves the other one lost and wondering what to do for a whole day. If this friend keeps backing out of plans, they become the 'unreliable friend' I mentioned earlier and you usually end up more distant.

So make plans, stick to them and don't double book yourself.