I am developing a swift iOS application that is calling a custom Alexa Skill that I created in Python. The Alexa skill has access to event and context in its lambda_handler(event, context) function. I would like to serialize the event's json into a DynamoDB table, so that I can access the event parameters from within the iOS app. However, I need to pass a unique identifier for the database object from the iOS app to he lambda function of the Alexa Skill via the AVS request. So far, all the parameters that can be used as unique identifiers of the database object, that I'm passing to AVS from the iOS side, like messageId and dialogRequestId are not available in the lambda function, or I don't know how to access them from within the lambda function. How can I make a unique ID available to both iOS application and lambda function?