You can configure Dialogflow to search your WordPress FAQS, Documentation and other posts for certain keywords. You do this using the Dialog process known as Fulfillment.
In order to set this up you need to provide API.ai something known as a webhook. You can find your hook information under the TICKETS->SETTINGS->SMART RESPONSES. Scroll down to the Dialogflow (API.ai) section and look for Fulfillment Webhook URL. Provide this in the Dialogflow Fullfillment configuration tab. No authentication is required to use it.