public DirectLineClient StartNewConversation()
        {
            var directLineClient = new DirectLineClient();
            var newConversation  = directLineClient.Conversations.StartConversation();

            ConversationMemoryCache.Add(newConversation.ConversationId, directLineClient);
            return(directLineClient);
        }
        public DirectLineClient GetClient(string conversationId)
        {
            var client = ConversationMemoryCache.Get(conversationId);

            if (client == null)
            {
                client = StartNewConversation();
            }
            return(client);
        }