The rejected older woman
I found the scenes with Patricia Barry, the older woman who meets with Al Pacino in the bar, particularly heartbreaking. He tells her, "We'll call you," and she says, "No, you won't." Later she sees him in the bar with Ellen Barkin, and she leaves in tears.
I guess Al couldn't have told her that the point of the meeting was a murder investigation, but it certainly would have helped ease the pain of rejection!