Firstly, you should check if there is any oil mark down there where you park the Car daily and whenever you park the car even for 1~2 hours.
If no, then open its bonnet and carefully check if you can see some poured oil on the Engine, outside the lid, or anywhere near to it. Because sometimes if there is a very minor leakage, then oil doesn’t drop to the surface and just burn with the Engine heat. So check it by yourself first.
Don’t go to the Honda Centre so quickly to complain it and unless you observe & find yourself the possible reason.
FYR, the Honda workers/Technicians are very smart. Its possible that they poured 3L bottle of engine oil & charged you 4L or something like that !! Well, chances are less but it happens.
Also possible that they used some very low grade quality oil which burnt inside by itself !! Again, though the chances are v. less, but possibilities are there !!
Then since today, everyday check the oil gauge by yourself & observe it.
By the way, WHICH ENGINE OIL (& VISCOSITY) YOU USED ?
Or which oil Honda recommends to use for Honda CITY & change after how many KM ?