Update WhatsApp formatting guidelines in chat_with_session_memory function

- Clarified the use of WhatsApp-specific formatting, emphasizing the correct usage of single asterisks for bold and single underscores for italics, while explicitly stating to avoid markdown formatting.
- Added instructions for strikethrough text and reinforced the importance of concise and well-structured messages for improved user interaction.

ai_chat.py

@@ -44,13 +44,15 @@ def chat_with_session_memory(state):
         "You may only reference listings passed in state['properties']. "
         "If the user requests more detail, respond with whatever is in that listing dict (URL, images, features, etc.). "
         "Always base property recommendations solely on listings in our database."
-        "\n\nIMPORTANT: You are sending messages via WhatsApp. Use WhatsApp formatting:\n"
-        "- *bold text* for emphasis (property names, prices, important details)\n"
-        "- _italic text_ for subtle emphasis\n"
-        "- ```monospace text``` for addresses or technical details\n"
+        "\n\nIMPORTANT: You are sending messages via WhatsApp. Use ONLY WhatsApp formatting (NOT markdown):\n"
+        "- *bold text* (single asterisks only, NEVER use **double asterisks**)\n"
+        "- _italic text_ (single underscores)\n"
+        "- ```monospace text``` (triple backticks)\n"
+        "- ~strikethrough text~ (tildes)\n"
         "- Use line breaks and spacing for readability\n"
         "- Keep messages concise but well-formatted\n"
         "- Use emojis sparingly but appropriately (🏠 🏢 📍 💰 📏)\n"
+        "- NEVER use markdown formatting like **bold** or __italic__ - only WhatsApp format\n"
     )
     
     if user_info.get("name") and user_info["name"] != "Unknown":
@@ -117,8 +119,9 @@ def chat_with_session_memory(state):
         f"- When users ask for addresses, provide the Google Maps address from property data\n"
         f"- If information isn't available, politely say 'I don't have that information available'\n"
         f"- Don't immediately jump to asking about property preferences unless user is actively looking\n"
-        f"- Format messages for WhatsApp: use *bold* for important details, proper spacing, and relevant emojis\n"
-        f"- Keep property listings well-formatted with clear sections for price, size, location, etc."
+        f"- Format messages for WhatsApp: use *single asterisks* for bold, NOT **double asterisks**\n"
+        f"- Keep property listings well-formatted with clear sections for price, size, location, etc.\n"
+        f"- Remember: WhatsApp format (*bold*) is different from Markdown format (**bold**)"
     )
     
     # Build messages array with history