Errors occurring in the code after updating Azure.AI.OpenAi to newer version

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           OpenAIClient client = new OpenAIClient(new Uri(openAiEndpoint), new 
             AzureKeyCredential(openAiApiKey));
            var chatCompletionsOptions = new ChatCompletionsOptions
            {
                Messages =

            {
            new ChatMessage(ChatRole.System, @"You are the virtual assistance of .."),
            new ChatMessage(ChatRole.User, _conversationHistory)
        },
                Temperature = 0.5f,
                MaxTokens = 150,
                NucleusSamplingFactor = 0.95f,
                FrequencyPenalty = 0,
                PresencePenalty = 0,
            };

            var chatCompletionsResponse = await client.GetChatCompletionsAsync("openaigpt35turbo", chatCompletionsOptions);
            string chatbotResponse = chatCompletionsResponse.Value.Choices[0].Message.Content;

I have developed a chatbot using this code(C#). After updating “Azure.Ai.OpenAi” NuGet package from 1.0.0 beta 6 to 2.0.0 beta 2 (latest) this provided code gave errors. How to change this code according to “Azure.Ai.OpenAi” 2.0.0 beta 2 version?