This is probably the most successful one I have sent:
I lova your profile. You look like a lovely sweet young lady.
I would love to spend some time with you. I have seen you're available on (XXX DATE XXXX). This coincides with a trip I have and I will most likely be at the (XXX VENUE XXX).
Would it be ok for me to book this date?
I hope we can get it together.
Ha ha, it worked! My 1st email to Katie was a disaster unfortunately! It needed some Devine intervention for me! Every little helps