Hey there! Did you show the bathing suit to the investigator?
Yep! She just says it'll take a while to analyse it, and I should find some other way of getting people to reveal their guilt.
Hmm, did you give Clawdette to the investigator?
Ah, that was it! I thought I had...
For future projects, might I suggest some system that lets the player know if they've already exhausted a line of dialogue? So it's easier to tell what you haven't asked already.