Make a bot that is worthwhile to have
Concierge bots are all nice, but in the end they do not fulfill the most pressing needs. Make a bot that does laundry, folds it, and puts it away. Make a bot that does the dishes, dries them, and puts them away. And all that not based on a predefined pattern and placement, but entirely adaptible to the various circumstances and desires.
As far as reservations for a restaurant, there are already apps that do not need more than two or three clicks, way faster than discussing with a bot where I want to go (typically, there are favorite places), how many (usually the same number), and when. For me neither is useful because the places I like usually have tables available or do not take reservations because they have so much traffic that they do not want to and need to block off a table for a party that shows up late.
I do understand that making a restaurant reservation bot is a first step and a manageable task, but nothing worthwhile news headlines. I hope it works better than Cortana which is utterly inept to understand a single word I say.