Update app.py

app.py

@@ -28,14 +28,15 @@ for message in st.session_state.messages:
         st.markdown(message['content'])
         
 ## messages element format: {'role':'user', 'content':'<user prompt>'}
-
-for gr in greetings:
-    with st.chat_message("assistant"):
-        st.markdown(gr)
-
-    st.session_state.messages.append({
-        'role':'assistant',
-        'content': gr})
+        
+if st.session_state.messages==[]:
+    for gr in greetings:
+        with st.chat_message("assistant"):
+            st.markdown(gr)
+    
+        st.session_state.messages.append({
+            'role':'assistant',
+            'content': gr})
 
 if prompt:=st.chat_input("Enter your query"):
     with st.chat_message("user"):