Climbing from FL 70 to FL 100, Lose Contact with Approach

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

The exchange

3 turns in order

You, the pilot

Delhi Control IFLY 160 Heavy, negative contact with Delhi Approach, passing FL 70 for FL 100

ATC

IFLY 160 Heavy Delhi Control, maintain this frequency, cleared to FL 280, report reaching

You, the pilot

Maintain this frequency, cleared to FL 100, will report reaching IFLY 160