Hey Mariah, you seem like a girl I could feel comfortable with. I get a pretty chill vibe from you. I love your style. You look like you workout and your clothes look good on you. I like that classy black dress you have in one of your photos. I think black is sexy, that's why I got a black truck.

Anyways, I'd love to know more about you. Message me back soon.
-Justin
Usually my messages are one-liners like hey what's up or some comment. I took my time this one and tried to build rapport by building comfort and setting a chill tone. I also thought I flirted a bit with the truck remark and the winky face. Finally, I concluded with a call to action requesting that she write me back.
I've messaged this girl a couple of times before, but there was no response in the past. I think I've messaged her a total of three times, each about a month apart.