Ask for Descent, Maintain Rate of Descent

7 turns, word for word from the oral. Read the pilot lines out loud.

The exchange

7 turns in order

You, the pilot

Kolkata Control IFLY 160 Heavy, 90 DME CEA, FL 350, estimating Bravo 0515, ETA Kolkata 0530, information Bravo, request descent

ATC

IFLY 160 Kolkata Control FL 250

You, the pilot

Leaving FL 350 for FL 250, will report passing FL 270

ATC

Request your rate of descent

You, the pilot

700 feet per minute

ATC

Maintain rate of descent 700 feet per minute or less, check before increasing

You, the pilot

Will maintain rate of descent 700 feet per minute or less, check before increasing