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I usually end each message with a question.
This is not an interview, dont question her every time u message, because she'll just get bored and its the reason why she probably doesnt message u back. You need to throw some negs, they need to be very playful though and make sure u use emotions with them. Also, get her to qualify herself (look this up if u need help on this). Im not saying stop questioning her, but make the conversation as fun as possible, every other guy is going to ask her what shes been up to and her favourite hobbys and such. Sometimes i just dont care and ask her to go and rob a bank with me(obviously not serious), because girls love roleplay, and then you just carry on from there.
Personally, i dont like your opener, you need to be more creative and such, the conversation just sounds a little plain from the beginning. Lighten it up a little, i cant help you on the opener because i dont do much opening on-line but try something else instead because it doesnt sound to lively.
Hope i helped