Do you get annoyed if you go somewhere for a meal and you get asked this?
I went out with some friends for breakfast this morning and we were behind someone else waiting to be seated (we'd booked) and they were asked if they had booked (as were we also asked) and the woman got really cross and het up about it, saying they hadn't but asking why did it matter, she could see the had spare tables, if you have to book why not have a sign, they just want some breakfast, she was sick of being asked all the time, if they didn't want her business......
The guy seating could barely get a word in edgeways for her rant, but when he did he explained that they take bookings and walk ins, but bookings may have booked a specific table, have certain requests or requirements they'd voiced at booking so it was important to know if the customer they were about to seat had booked or not so they could get the right table, had the right info. But as a walk in they were welcome to which she replied being asked if she'd booked made her feel unwelcome as a walk in.
Seems fair enough to me and the friends that I was with to ask, a sensible way to manage things, and it was just a question and asked politely. We were a bit taken aback and confused by her attitude but one of my friends said they've had conversations with people who hate being asked.
I just found it bizarre that she (or anyone else) would take such offence at it, surely if you have booked you want them to have your booking and find out who you are so you can be seated at the right table with the right info (if there is any of course).