ID this song

It's a song sung by a male singer (singer/songwriter ?)
whose voice resembled a bit like Kenny Rankin.
A mid tempo/slowie and good melody love song.
There's whistling near the end of the song
and it always repeated these verses:

"Thank you for the good time.
Thank you for  your love ..
Thank you for the kisses
Thank you for being with me ..
"

It's sometime in the late 70s that i heard it on radio