Why should I use bot service instead of DialogFlow

The Microsoft Bot Framework and Azure Bot Service are comprehensive platforms for building enterprise-grade conversational AI experiences. They include a set of open source SDKs, tools and services which enable developers to build, test and connect bots that interact naturally with users wherever they are. With the Microsoft Bot Framework, it is easy to create a bot with the ability to speak, listen, understand, and learn from your users by integrating Azure Cognitive Services.

Azure Bot Services

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