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Response of below lambda code is not accepting by lex, but in return statement if I change json slots value as slot variable declared, then working i.e response of it accepting by lex. Its full confusing because variable slot and variable d has same value, please find my cloud watch log screenshot attached FYI.

def lambda_handler(event,context):
 slot=event['currentIntent']['slots']
 d="'Intro': None, 'Start': None, 'ReturnBooking': None, 'name': None, 'pickup': None, 'conformation': None, 'location': None, 'Count': None, 'comfort': None"
 print("using dict:",slot,"using variable:",d)
 return 
 "dialogAction": 
 "type": "Delegate",
 "slots": d
 
 

Please help me if any one figured out.

If a slot is not holding a value, then it should be null not None. It looks like Cloudwatch is logging null as None for you. And that should be the difference between your variables: slot and d.

So this is what d should be:

d="'Intro': null, 'Start': null, 'ReturnBooking': null, 'name': null, 'pickup': null, 'conformation': null, 'location': null, 'Count': null, 'comfort': null"

But there's really no reason to recreate a string for the slots of your intent. You should simply pass the slots=event['currentIntent']['slots'] variable back to Lex. And if you want to change a slot in Lambda, treat it like an array and set one of the slots to a new value:

slots['slotName'] = "new value";

Or you can remove a slot's value by setting it to null:

slots['slotName'] = null;

Then return slots back to Lex.