How do I turn phone dial pad sounds off

Hello Sai_Venkata!

The only way to turn off the dialer pad sounds would be by putting the device in silent mode. (push the ring/silent switch towards the back of the device so the orange strip is showing)

How to put your iPhone on vibrate, ring, or silent mode

There is no setting to specifically turn off these sounds when the device is in ring mode.

I hope this is helpful. Good Luck!

Other than muting the phone this is all you can do:

Change iPhone keyboard sounds or haptics - Apple Support