How do I properly leave a conversation in Cyberpunk 2077?

For reference this is on PC, on a keyboard and mouse.

It seems that the only way to leave a conversation is to just... walk away? But that seems a little odd to me, as when you approach that same person again, the same conversation stuff shows up. This is particularly odd when there are other items near the person (the first time you come across the fight-ring coach, near V's apartment) that I cannot pick up, because the game locks me into the conversation options.

Is there a button to leave a conversation properly, or is walking away from the person the actual right way?

If you're holding a conversation with somebody then walking away from the conversation is actually the correct way to end the conversation. There isn't a way to politely end the conversation.

Note that if you actually walk away while they're trying to talk to you that your current position in the conversation is saved and picked up on next time you talk to that person - similar to how phone calls with automatically hang up if you trigger particular actions, only for you to automatically call the person back once the interruption has finished.