@djsumdog
I usually do a long message. I do: "Hello. Sorry to bother you. Do you know what... [insert as many lines of text as I feel I need to cover everything I want to ask, or say, kinda like I'm doing right now, only it can easily go 2x or 3x times. I really don't have a limit to be honest]... Thanks!"
It doesn't matter to me that the answer is short. Usually I try to make my message as explicit and clear so it doesn't really need much back and forth.