Update app.py

app.py

@@ -1,7 +1,25 @@
 import streamlit as st
 import streamlit.components.v1 as components
 
-st.chat_input("biggie")
+st.title("Echo Bot")
+
+# Initialize chat history
+if "messages" not in st.session_state:
+    st.session_state.messages = []
+
+# Display chat messages from history on app rerun
+for message in st.session_state.messages:
+    with st.chat_message(message["role"]):
+        st.markdown(message["content"])
+
+# React to user input
+if prompt := st.chat_input("What is up?"):
+    # Display user message in chat message container
+    with st.chat_message("user"):
+        st.markdown(prompt)
+
+    st.session_state.messages.append({"role": "user", "content": prompt})
+    
 default_chat_input_value = "Default Value"
 js = f"""
     <script>