Dont buy a sedan if you will drive in the city. No point in taking a used automatic sedan when you can buy a new hatch.
Grand i10 sports cost 5.6 , asta cost 5.8lakhs. Other than this would recommend brio automatic since you searched honda city at. Brio will cost 6lkhs ex showroom .
In brio you will get 5 speed gearbox plus abs
plus 2 airbags.
In grand i10 you will get loads of features.
If you still want to go for a used automatic , i will say look for a used automatic hatch like i10 or the brio.