diff --git a/Hotel/HotelDataModels/Models/IConferenceBooking.cs b/Hotel/HotelDataModels/Models/IConferenceBooking.cs
new file mode 100644
index 0000000..8b8a05d
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IConferenceBooking.cs
@@ -0,0 +1,6 @@
+namespace HotelDataModels.Models
+{
+    public interface IConferenceBooking : IId
+    {
+    }
+}
diff --git a/Hotel/HotelDataModels/Models/IDinner.cs b/Hotel/HotelDataModels/Models/IDinner.cs
new file mode 100644
index 0000000..47f60e4
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IDinner.cs
@@ -0,0 +1,6 @@
+namespace HotelDataModels.Models
+{
+    public interface IDinner : IId
+    {
+    }
+}
diff --git a/Hotel/HotelDataModels/Models/IHeadwaiter.cs b/Hotel/HotelDataModels/Models/IHeadwaiter.cs
new file mode 100644
index 0000000..6c106ba
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IHeadwaiter.cs
@@ -0,0 +1,8 @@
+
+namespace HotelDataModels.Models
+{
+    public interface IHeadwaiter : IId
+    {
+
+    }
+}
diff --git a/Hotel/HotelDataModels/Models/IRoom.cs b/Hotel/HotelDataModels/Models/IRoom.cs
new file mode 100644
index 0000000..3de6f4d
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IRoom.cs
@@ -0,0 +1,7 @@
+
+namespace HotelDataModels.Models
+{
+    public interface IRoom : IId
+    {
+    }
+}