How to send a message to a thread (reply) using botbuilder 4.0 SDK

@ituser1n03v
To reply to an existing message, call ReplyToActivity in .NET or session.send in Node.js. The Bot Builder SDK handles all the details.

If you choose to use the REST API, you can also call the /v3/conversations/{conversationId}/activities/{activityId} endpoint.

Ref Doc: https://learn.microsoft.com/en-us/microsoftteams/platform/resources/bot-v3/bot-conversations/bots-conversations#sending-replies-to-messages

Thanks, 

Nivedipa

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