Which version? If it's Michael Buble's original it's a very, very, slow rumba, and quite challenging to dance to.

It seems like posters who want advice for dancing to a wedding song really pick some tough ones. But that happens at the dance studio as well. I have seen instructors just tell couples to forget the song they picked, or forget worrying about doing a proper dance to it. Seasoned professionals would come up with a routine, quite likely a slow rumba, to this tune, but a wedding couple will have a tough time with it. Oddly enough, the version of this song by Keith Anderson is a little quicker tempo, and it almost gets to a point where you are thinking of a Viennese Waltz to it. But it just doesn't fit that either. I too would suggest trying a few slow rumba sequences and slow turns to see if you could make something look nice and elegant with it. A teaching pro certainly would provide solid advice.