Question

why dies the conductor call valli madam

Answer 1

Valli is trying to behave more mature than her age. She is trying to look overconfident and smart. When the conductor tries to help her get on the bus,she replies that she will manage and doesn't need his help.The conductor is amused at her behavior and in an effort to tease her calls her ‘madam’.

Answer 2

Valli is trying to look over confident and smart. She behaves as if grown up lady. For that reason the conducter amushed her behaviour and called Valli 'madam'.