Reba McEntire has one big regret when it comes to her relationship with Dolly Parton. Talking to “Entertainment Tonight,” the singer explained, “She did call me the last of July, and I was in a meeting and I missed her call. I tried to get back in touch with her and I couldn’t; never made connection. And then when…my buddy called me and said, ‘Dolly’s gone,’ I thought, ‘I’ll never know why she called me’.” However, she knows it won’t be a mystery forever, adding, “I’ll find out one day.”