its the second choice option where he asks if he can have a light i think
Hi!!! Sorry to hear that you've been having trouble progressing the game- I'll definetly look into fixing that in the next patch! But for now try clicking on the cigaratte tray on Floor 6 then initiate the lighter conversation and choose the Can I have a light option again! That'll hopefully let you progress it with no problem! Sorry for the inconvenience and thank you so much for checking the game out !!