Answer may be:

Amazon Lex is a service for building conversational interfaces into any application utilizing voice and text. Amazon Lex gives the advanced deep learning functionalities of Automatic Speech Recognition (ASR) for changing over voice to text, and Natural Language Understanding (NLU) to perceive the purpose of the text, to empower you to construct applications with exceptionally captivating user experience and lifelike conversational collaborations. With Amazon Lex, the similar deep learning technologies that power Amazon Alexa is now accessible to any developer, empowering you to rapidly and effectively build sophisticated, natural language, conversational bots ("chatbots").

Benefits of using AWS / Amazon Lex:

• Ease of Access.
• Seamless deployment and scaling.
• Built-in integration with the AWS platform.
• Cost-effectiveness.

Some of AWS Lex’s Use Cases 

• Call Center Bots
• Informational Bots
• Application Bots
• Enterprise Productivity Bots
• Amazon Lex in Internet Of Things (IoT)

For more details, read the full blog:

All About AWS Lex