Depends on what they can't remember, probably. If the note's true for them, then it might be useful to know what the thing they think they have to do is.

[He's not going to make any assumptions about whether anything someone thinks when their memories are missing is actually the right thing to do or not. He made his own very wrong assumptions before he got his memories back. Still, it would be information. He shrugs slightly.]

Or it might just be useless. There's no way to tell.