private async Task RespondPowerVirtualAgentsBotReplyAsync(DirectLineClient client, RelayConversation currentConversation, ITurnContext <IMessageActivity> turnContext) { var retryMax = WaitForBotResponseMaxMilSec / PollForBotResponseIntervalMilSec; for (int retry = 0; retry < retryMax; retry++) { // Get bot response using directlineClient, // response contains whole conversation history including user & bot's message ActivitySet response = await client.Conversations.GetActivitiesAsync(currentConversation.ConversationtId, currentConversation.WaterMark); // Filter bot's reply message from response List <DirectLineActivity> botResponses = response?.Activities?.Where(x => x.Type == DirectLineActivityTypes.Message && string.Equals(x.From.Name, _botService.GetBotName(), StringComparison.Ordinal)).ToList(); if (botResponses?.Count() > 0) { if (int.Parse(response?.Watermark ?? "0") <= int.Parse(currentConversation.WaterMark ?? "0")) { // means user sends new message, should break previous response poll return; } currentConversation.WaterMark = response.Watermark; await turnContext.SendActivitiesAsync(_responseConverter.ConvertToBotSchemaActivities(botResponses).ToArray()); } Thread.Sleep(PollForBotResponseIntervalMilSec); } }