Although the song is included on some versions of Odyssey, it is not included in the Odyssey song book. I have tried a quick internet search but without success. Although the lyrics are easily available, I'm not sure that the sheet music has been published.
I hope someone will be able to point you in the right direction as it sounds like the perfect choice to play during a wedding.
Best wished for your big day and I hope you enjoy being a part of our Hayley community!