private static async Task FillOutUserProfileAsync()

in SDKV4-Samples/dotnet_core/PromptUsersForInput/CustomPromptBot.cs [87:144]
56 lines of code
8 McCabe index (conditional complexity)

        private static async Task FillOutUserProfileAsync(ConversationFlow flow, UserProfile profile, ITurnContext turnContext)
        {
            string input = turnContext.Activity.Text?.Trim();
            string message;
            switch (flow.LastQuestionAsked)
            {
                case ConversationFlow.Question.None:
                    await turnContext.SendActivityAsync("Let's get started. What is your name?");
                    flow.LastQuestionAsked = ConversationFlow.Question.Name;
                    break;
                case ConversationFlow.Question.Name:
                    if (ValidateName(input, out string name, out message))
                    {
                        profile.Name = name;
                        await turnContext.SendActivityAsync($"Hi {profile.Name}.");
                        await turnContext.SendActivityAsync("How old are you?");
                        flow.LastQuestionAsked = ConversationFlow.Question.Age;
                        break;
                    }
                    else
                    {
                        await turnContext.SendActivityAsync(message ?? "I'm sorry, I didn't understand that.");
                        break;
                    }

                case ConversationFlow.Question.Age:
                    if (ValidateAge(input, out int age, out message))
                    {
                        profile.Age = age;
                        await turnContext.SendActivityAsync($"I have your age as {profile.Age}.");
                        await turnContext.SendActivityAsync("When is your flight?");
                        flow.LastQuestionAsked = ConversationFlow.Question.Date;
                        break;
                    }
                    else
                    {
                        await turnContext.SendActivityAsync(message ?? "I'm sorry, I didn't understand that.");
                        break;
                    }

                case ConversationFlow.Question.Date:
                    if (ValidateDate(input, out string date, out message))
                    {
                        profile.Date = date;
                        await turnContext.SendActivityAsync($"Your cab ride to the airport is scheduled for {profile.Date}.");
                        await turnContext.SendActivityAsync($"Thanks for completing the booking {profile.Name}.");
                        await turnContext.SendActivityAsync($"Type anything to run the bot again.");
                        flow.LastQuestionAsked = ConversationFlow.Question.None;
                        profile = new UserProfile();
                        break;
                    }
                    else
                    {
                        await turnContext.SendActivityAsync(message ?? "I'm sorry, I didn't understand that.");
                        break;
                    }
            }
        }