statefull bot.cs

public record GetFirstNameState() : IChatState
{
    public ChatView View() => ChatView.Multiple(
        ChatView.WithText("Enter first name"),
        ChatView.WithTextHandler(OnText)
    );

    private async ValueTask<IChatState> OnText(TextMessage msg)
    {
        return new GetLastName(msg.Text);
    }
}

public record GetLastName(string FirstName) : IChatState
{
    public ChatView View() => ChatView.Multiple(
        ChatView.WithText("Enter last name"),  
        ChatView.WithTextHandler(async msg => new PickGender(FirstName, msg.Text))
    );
}

public record PickGender(string FirstName, string LastName) : IChatState
{
    public ChatView View() => 
        ChatView.WithReply(
            "Pick your gender",
            new()
            {
                { "Man", async () => new ShowName(FirstName, LastName, "Man")},
                { "Woman", async () => new ShowName(FirstName, LastName, "Woman")},
            }
        );
}

public record ShowName(string FirstName, string LastName, string Gender) : IChatState
{
    public ChatView View() => ChatView.WithText($"{FirstName} {LastName} {Gender}");
}