With Custom It, add random in your messages.
Generate messages wholly or partly random from your proposals and send them!
You can even schedule the sending of these messages at a fixed time.
Need to say you're leaving, or to send sweet words, it's easy:
1: Add a message type (eg "Sweet Words")
2: Add one or more lists of proposals (eg "Greetings" and "Small names")
3: In each list, add the various proposals (eg, "Hello" or "Hi" in "Greetings" list and "Mrs" and "Miss" in the "Small names")
4: It'll just generate a random message (If there are multiple lists, they are used in the order and a space is inserted between each proposal, which could give the message "Hello Mrs" or "Hello Miss" with the configuration defined here).