public static void Main()
Console.WriteLine("Welcome to the Guest Book App");
Console.WriteLine("*****************************");
Console.Write("What is your party/group name: ");
string partyName = Console.ReadLine();
Console.Write("How many people are in your party: ");
string partySizeText = Console.ReadLine();
bool isValidNumber = int.TryParse(partyName, out int partySize);