我是Microsoft Bot Framework的新手。我已经使用Microsoft Bot Framework创建了一个bot。如何为单个用户创建会话。目前我面临的问题是，每当多个用户创建连接时，变量中的值会被覆盖，从而为用户提供错误的值。
下面是代码

if (turnContext.activity.text === 'CCP') {
const url = await this.connectToAgent(members);
const initialMessage = {
    topic: "aws/subscribe",
    content: {
        topics: ["aws/chat"]
    }
};
ws = new WebSocket(url[1]);
ws.addEventListener("open", () => {
    ws.send(JSON.stringify(initialMessage));
});
await turnContext.sendActivity("Please wait while we connect you to an agent.");
conversationReferences[currentUser] = TurnContext.getConversationReference(turnContext.activity);
adapter = turnContext.adapter;
ws.addEventListener('message', async function (event) {
    const msg = JSON.parse(event.data);

});
let sendChatHistory = (function() {
    let executed = false;
    return function() {
        if (!executed) {
            executed = true;
            const param = {
                ConnectionToken: connectionToken, /* required */
                Content: sendHistory, /* required */
                ContentType: 'text/plain', /* required */
            };
            connectparticipant.sendMessage(param,async function (err, data) {
                chatHistory = '';
                sendHistory = '';
                if (err) {
                    errorMsg = "Error while sending a message";
                }
            });
        }
    };
})();
sendChatHistory();   
}