diff --git a/CSharp/OpenAi/CompletionChatMessage.cs b/CSharp/OpenAi/CompletionChatMessage.cs
new file mode 100644
index 0000000..fc28ad7
--- /dev/null
+++ b/CSharp/OpenAi/CompletionChatMessage.cs
@@ -0,0 +1,12 @@
+using System.Runtime.Serialization;
+
+namespace Temp.OpenAi;
+
+public record struct CompletionChatMessage()
+{
+    [DataMember(Name="role")]
+    public readonly string Role = "user";
+    
+    [DataMember(Name="content")]
+    public string? Content { get; set; } = string.Empty;
+}