Mentor grup

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;

namespace Mentor_Group
{
    class Mentor
    {
        public string Name { get; set; }
        public List<string> comments { get; set; }
        public List<DateTime> dates { get; set; }
    }

    class Program
    {
        static void Main()
        {
            List<Mentor> mentorList = new List<Mentor>();
            string input = Console.ReadLine();
            do
            {
                if (input=="end of dates")
                {
                    break;
                }

                string[] inputArr = input
                    .Trim()
                    .Split(new char[] { ' ', ',' }, StringSplitOptions.RemoveEmptyEntries);
                string nameMentor = inputArr[0];
                DateTime date;

                if (!mentorList.Any(x => x.Name == nameMentor))
                {
                    Mentor user = new Mentor();
                    user.dates = new List<DateTime>();
                    user.comments = new List<string>();
                    user.Name = nameMentor;
                    if (inputArr.Length > 1)
                    {
                        for (int i = 1; i < inputArr.Length; i++)
                        {
                            date = DateTime.ParseExact(
                                inputArr[i], "dd/MM/yyyy", CultureInfo.InvariantCulture);
                            user.dates.Add(date);
                        }

                    }
                    mentorList.Add(user);
                }
                else
                {
                    if (inputArr.Length > 1)
                    {
                        for (int i = 1; i < inputArr.Length; i++)
                        {
                            date = DateTime.ParseExact(
                                inputArr[i], "dd/MM/yyyy", CultureInfo.InvariantCulture);
                            if (!mentorList.Any(x => x.dates.Contains(date)))
                            {
                                int index = mentorList.FindIndex(x => x.Name == nameMentor);
                                mentorList[index].dates.Add(date);
                            }
                        }
                    }
                }

                input = Console.ReadLine();

            } while (input!="end of dates");

            string inputComments = Console.ReadLine();

            do
            {
                if (inputComments=="end of comments")
                {
                    break;
                }
                string[] inputCommentsArr = inputComments
                    .Trim()
                    .Split('-');
                string name = inputCommentsArr[0];
                string comment = inputCommentsArr[1];

                if (mentorList.Any(x => x.Name == name))
                {
                    int index = mentorList.FindIndex(x => x.Name == name);
                    mentorList[index].comments.Add(comment);
                }

                inputComments = Console.ReadLine();
            } while (inputComments!="end of comments");

            var sortMentorList = mentorList.OrderBy(x => x.Name).ToList();
            foreach (var sml in sortMentorList)
            {
                Console.WriteLine(sml.Name);
                Console.WriteLine("Comments:");
                foreach (var comment in sml.comments)
                {
                    Console.WriteLine("- {0}",comment);
                }
                Console.WriteLine("Dates attended:");
                var sortDates = sml.dates.OrderBy(x => x).ToList();
                foreach (var date in sortDates)
                {
                    Console.WriteLine("-- {0}",date.ToString("dd/MM/yyyy"));
                }
            }
        }
    }
}