We have an exporter[0] and importer[1] that lets you export and import your Dialogflow agent to and from Alexa. We also have a sample walking through importing a Alexa skill into Dialogflow [2]
[0] https://dialogflow.com/docs/integrations/alexa-exporter
[1] https://dialogflow.com/docs/integrations/alexa-importer
[2] https://github.com/dialogflow/fulfillment-webhook-importer-n...