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In this section, you will learn all you need to know about Dialogflow for completing this project. Most important for the current project is that Dialogflow facilitates the implementation of Natural Language Understanding of an agent, in the form of intents (understanding classifying what the user wants based on its utterancesays) and entities (recognizing the concepts that a user refers to). In order to link these intents and entities to the dialogue manager, you will also learn to create Prolog functions that can filter the recipe database by using the extracted information by Dialogflow.
To begin, you should start with DialogFlow: Create an Agent, Intents and Entities
Then you should follow this, Dialogflow: Connecting Dialogflow Agent to Our Agent
Lastly, you should read and complete the project instructions for your section here, DialogFlow and Filter Instructions
Good luck!