HDFC Bank Smart Buy — Flight ticket booking

Address:	Hyderabad, Andhra Pradesh, 500081
Website:	Smart but hdfc

Hi team, I have sent mail to [protected]@smartbuyoffers.co for flight booking reschedule, still didn't get any replies... I have given all details in mail as below

I have booked flight ticket, on 28th Dec 2016. from

Hyderabad to Chennai on 20th Jan 2017 (PNR - JIJZHB)

HDFC Bank SmartBuy Ref No : [protected]
Cleartrip Ref Number: [protected]
Booked on : Wed 28 Dec 2016

Chennai to Hyderabad 27th Jan 2017 (PNR - VFFFJN).

HDFC Bank SmartBuy Ref No : [protected]
Cleartrip Ref Number: [protected]
Booked on : Wed 28 Dec 2016

Due to some personal work i would like to re-schedule those journeys as below.

Hyderabad to Chennai on 28th or 29th or 30th or 31st of Jan 2017 (based on availability)

Chennai to Hyderabad 3rd or 4th or 5th or 6th of Feb 2017 (based on availability)

Could you please help on this and let me know, How much would be extra charge for re-scheduling. OR Do i need to check with anyone else for the same request?