Update app.py

app.py

@@ -103,7 +103,7 @@ if prompt := st.chat_input("Start talking with your tutor!"):
         for response in openai.ChatCompletion.create(
             model=st.session_state["openai_model"],
             messages=[
-                {"role": m["role"], "content": m["content"]}
+                {"role": reverse_name_to_role(m["role"]), "content": m["content"]}
                 for m in st.session_state.messages
             ],
             stream=True,