Can I ask my friend to stick to a schedule for when we can talk?
Why do you need a schedule?
I cannot stand other people's whims and ignorance for this issue.
It is wrong to think people live life on a schedule. You should be more kind to friend or people might want to avoid you.
I'm the type of guy who likes to catch things early whereby people like to shrug them off.
Well, your friend might only be able to see you at certain times. Other people may find it rude if you are forcing friends to stay on a schedule for when they can speak with you, and this friend may not want to speak to you anymore if you continue with this.