How to send predefined/canned SMS/iMessages?

Is there a way to prepare predefined/canned messages in order to quickly send them by SMS/iMessage on the iPhone or iPad? I find myself quite often using the same 4-5 templates: - *I'm in a meeting, I will call you later!* - *I'm on my way* - *Ok, drop me an email!* - *Is it a good time to talk?*