Air India — Reschedule

Hi,
I had booked tickets for my mom dad and my brother to travel from Raipur-Kolkata on 20th July 2021. They all got RT PCR test done and my my mom got positive for Covid-19 and my dad and brother was negative. Hence immediately we all isolated ourselves as per govt guildlines. I immediately called the customer care and got the open tickets for them the PNR for Alka Agarwal is YVFV5
and Open ticket confirmation is 10903581. And the pnr for Gokul and Rishi Agarwal is HT118 and open ticket confirmation no 10906144.
I would like to reschedule the tickets for Gokul and Rishi Agarwal for 23rd July 2021

I called the city office no which I got from cus care they said that in Raipur there is no city office and asked me to mail to [protected]@airindia.in from which I got an automated reply stating that I need to call customer care..