In my experience I used to always do texts that were straight away 'hey wanna go for a drink' etc no fucking about, and I found that to never lead anywhere. I find best is to get chatting, a laugh and a flirt then ask for the drink as a natural progression from there. It's what seemed to help me anyway. And your first text, personally, was weak, you have to give them a reason to respond. Even if the reason is simply asking a question.