You are asked to build a conversational chatbot that can 
-Communicate with the user in natural language. 
-Pull out the relevant and detailed information from the conversation. 
Which of the listed below is the appropriate choice?

Answer options:

A.LUIS
B.QnA maker
C.Azure speech services
D.Immersive Reader

Correct Answer:A
Option A is CORRECT. Cloud-based conversational AI service, LUIS can build natural language in applications and use natural language to communicate with users. Detailed and relevant information extraction from conversations is a feature of LUIS.
Option B is INCORRECT. QnA maker is an NLP service that helps find appropriate answers from a knowledge base.
Option C is INCORRECT. Azure speech services helps us perform the below in a single Azure subscription and does not help us build a conversational bot:
- speech-to-text 
- text-to-speech, and 
- speech-translation Option D is INCORRECT. Immersive Reader is a tool that is primarily intended for readers and enthusiasts in language learning by increasing reading accessibility. Immersive readers cannot be used in the given scenario.
References: 

https://docs.microsoft.com/en-us/azure/cognitive-services/luis/
https://docs.microsoft.com/en-us/azure/cognitive-services/qnamaker/
https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/
https://docs.microsoft.com/en-us/azure/cognitive-services/immersive-reader/