This is in the original key of the song. I listened to it and tried to figure out the
chords myself. I'm not entirely sure whether the chords for the chorus and the bridge-ish
part are correct, though. If there are any mistakes or whatever, please let me know. :) 
Nevertheless, enjoy. :D

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Intro: Bb F Gm  Bb F Gm

Bb                  F              Gm                Bb
Please will you come back to me
           F               Eb                              Bb
I was a fool just to leave you hanging
              F         Gm              Bb F Eb
If courage is all I need to find you
Bb                F               Gm                     Bb
When will the snow melt away
               F             Eb                            Bb
And all the pieces will fit together
                  F              Gm
Now I've got so much to say
          Bb F Eb                Bb F Eb
I need you, gonna find you

Chorus:
Bb              F     Gm
Looking for angel, are you angel
Bb              F       Eb
Looking for angel help
Bb                F     Gm
Calling for angel, are you my angel
Bb                F       Gm
Calling for angel help

Bb               F              Gm
Come back, come back, come back to me
F                           Eb
I cannot make it without you
Bb           F       Gm
On my knees, oh, won't you please
Eb                 F
Come back to me
Eb                 F            Bb (to intro chords below)
Come back to me, dear friend

(Bb) F Gm  Bb F Gm

[Repeat chorus]

Eb                 F           Gm
Come back to me, dear friend
Eb                 F           Gm
Come back to me, dear friend
Eb                 F           Bb (to intro chords below)
Come back to me, dear friend

(Bb) F Gm  Bb F Gm