Создал модели для поручителя

Hotel/HotelDataModels/HotelDataModels.csproj

@@ -6,8 +6,4 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
-  <ItemGroup>
-    <Folder Include="Models\" />
-  </ItemGroup>
-
 </Project>

Hotel/HotelDataModels/Models/IAdministratorModel.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HotelDataModels.Models
+{
+	public interface IAdministratorModel : IId
+	{
+		string AdministratorFIO {  get; }
+		string AdministratorPhone { get; }
+		string HeadwaiterLogin { get; }
+		string HeadwaiterPassword { get; }
+	}
+}

Hotel/HotelDataModels/Models/IConferenceBookingModel.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HotelDataModels.Models
+{
+	public interface IConferenceBookingModel : IId
+	{
+		int AdministratorId { get; }
+		int? ConferenceId { get; }
+		string PlaceСonference { get; }
+		DateTime? DateСonference { get; }
+		public Dictionary<int, IDinnerModel> ConferenceBookingDinners { get; }
+
+	}
+}

Hotel/HotelDataModels/Models/IDinnerModel.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HotelDataModels.Models
+{
+	public interface IDinnerModel : IId
+	{
+		string DinnerName { get; }
+		int DinnerСalorieСontent { get; }
+		double DinnerPrice { get; }
+		int AdministratorId { get; }
+	}
+}

Hotel/HotelDataModels/Models/IRoomModel.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HotelDataModels.Models
+{
+	public interface IRoomModel : IId
+	{
+		int RoomNumber { get; }
+		int CountBeds { get; }
+		double RoomPrice { get; }
+		int AdministratorId { get; }
+		public Dictionary<int, IDinnerModel> RoomDinners { get; }
+	}
+}