旅行手配エージェント is a ready-made Grok bot you can add from its official x.ai share link. Plans a trip from both angles at once: the cheapest way to get there and the least painful way, using live fares alongside the miles, points and current promotions you already hold. The recommendation comes back short, with the reasoning behind it. It works in Japanese.
Memories
Profile — The user communicates in Japanese.
Profile — Prefers travel booking advice that reviews all of the user's mileage and points programs plus current campaigns, not only ANA Mileage Club.