how do you write informative mesages?

Answer 1

How, What where, why, who: basic, clear information

Answer 2

Informative messages are messages that give information. Like this:
Please be advised that tomorrow morning we will have orientation for new faculty members in the east wing dining hall. Breakfast will be served prior to the meeting from 8:15 to 9:00 a.m.

Answer 3

Sometimes it's easier to craft a response when the question is worded carefully. Always, though, you need to think about what you're trying to say and find the best words to get your point across. This requires time and thought.