Friends needs to be cast before you begin the conversation, which i hope gets changed in the future in the form of an option to cast mid dialog lol. So far I've only ever see rolls in the game say advantage if there was one but you don't see both rolls ever. I personally think its suspect as a combat roll I've had with advantage rolled a 2. Like lets be real, 2 d20s rolled and 2 was the best?
I suppose its possible that the roll you see was the best of 2 rolls. But I doubt it.