List-Ex/House party

using System;
using System.Linq;
using System.Collections.Generic;

namespace fundamental14
{
    class MainClass
    {
        public static void Main()
        {

            int numberOfCommands = int.Parse(Console.ReadLine());

            List<string> guests = new List<string>();

            for (int i = 0; i < numberOfCommands; i++)
            {
                string[] arr = Console.ReadLine().Split();
                string name = arr[0];
                string element = arr[2];

                if (element == "going!")
                {
                    if (!guests.Contains(name))
                    {
                        guests.Add(name);
                    }
                    else
                    {
                        Console.WriteLine($"{name} is already in the list!");
                    }
                }
                else
                {
                    if (guests.Contains(name))
                    {
                        guests.Remove(name);
                    }
                    else
                    {
                        Console.WriteLine($"{name} is not in the list!");
                    }
                }
            }

            foreach (var guest in guests)
            {
            Console.WriteLine(guest);
            }
        }
    }
}