A good portion into Chapter 8, you'll be tasked in finding a gambling hall, in which you'll go to L'Amant to find info on where it is, which is the Champion District (The map will show a red circle).
Once there, it's on the bottom right corner, a shutter with an AC unit beside it. If you have good memory, you'll remember the password from a moment ago at L'Amant, if not, then I'll list it down below for you.
First Choice - Three Times
Second Choice - Can I talk to moon?
Third Choice - Chateaubriand, blue.
The trophy will pop immediately on hitting the last choice, if you selected these 3 responses.