London!

In jest only!
1) London:
Dad: This year summer would not be as harsh as in previous years, my son.
Son: Why dad?
Dad: Kolkata's weather will be at least partially like London's this year.
(2)Chappal:
Son: Leader of a ruling party ridicules Didi for wearing Hawai Chappal while using helicopter for election campaign.
Dad: Why not? Perhaps that leader does not know phonetically chopper and Chappal are close to each other.Here Hawai means 'in air'.
(3)Naxals:
Son: Dad, do you think more Naxals live in Kolkata than in other parts of the state?
Dad: Why, my son?
Son: Then why is percentage of vote polled so poor in Kolkata?