Simply replace the unfilled areas such as "" and "[date]" with your information.
I'm [name]. I saw your profile on [name of dating service] and I just had to message you.
You've really grabbed my interest! It seems from your profile that we have a lot of things in common. You sound like a fascinating person, someone that I would like to know more about.
I am a very [type] person who [enjoys life/takes life seriously/etc.]. My friends would describe me as [funny/intelligent/etc.]. Those who know me best say that I am [describe what your close friends say about you].
I have a passion for life and always make the most of the time I have been given. In others I value honesty, humor, intelligence and when somebody has direction in life, and knows where they're headed. Overall, I am quite a happy person, but I still find that I am missing that special someone in my life.
I look forward to hearing back from you soon.