It looks like a conversation with a person I haven't talked to in something that isn't either long enough for them to forget about me or someone close I haven't talked to in some time.

But let's be pedantic and you'll probably like this or the autism stereotypes aren't true, here's a few scenarios:

1. Girl I know to a good degree, will probably recall me if I say hi
2. Girl I barely interacted with but might recall me
3. Girl I only saw at school breaks, might not remember me

Your example will probably work on category 1. Category 2 MIGHT go along, although a simple hi is rather generic and therefore is more of a lottery bet than a sure bet. I can't tell how category 3 will respond, but probably not better than category 2.

Consider how you'd feel about the introductory messages if you were from each of those scenarios.

We could also dive into sub-scenarios, tailored to specific optimisations or lack of them. Such as my fashion choices, how I live, people I hang out with, etc. Although it's dubious how much they matter since all of this is my unresearched model in my head about online messaging.