There are four models concierge work. Customer asks, Reception Informs, Inside the Hotel Premise and Outside the hotel premise.

Hotel have telephones and apps to enable customer inbound and reception outbound. You must look at the usage analytics of these tools to figure out the overall volumes as a percentage of guests and their time within the premise.

If there is engagement, then it makes sense to build a tool to help improve that to become significant

In fact, the way i see it is that you are exploring a white labelled super app for distribution. you will be competing with a lot of big players like uber