Here in Bangalore, you can usually book directly from the Google Maps listing. Or sometimes click a link that will open in Swiggy/Zomato, and you just book from there.
At least in this city, reserving a table using the apps you already have on your phone is faster than using an LLM. Maybe these products are for people who know about the existence of Claude and ChatGPT but not Google Maps?
If I'm booking a restaurant I'll probably be discussing the date/time options with the people I'm going with, and I can't see how adding a chatbot to the mix is meant to help?
Most restaurants have a web UI which is very simple and easy to use.