GoAir — issue my travelling certificate

Address:

Mahipalpur cisf camp gate no 2, Mahipalpur byypass cisf camp, 110037

Requested sir/mam
I booked a ticket kolkata to delhi for 20 september 2019 (Nb5u4n) for my professional tour. But unfortunately i misplaced my boarding pass after completing the tour. Now i need confirmation that i board the flight on 20september 2019 as i have to submit it to account department of my govement office. Kindly provide me the boarding pass copy or any confirmation mail or letter. I shall be very thankful to you. I attached the copy of my flight ticket.
Please find the attachment.