pass user input to semantic search

app.py

@@ -38,7 +38,7 @@ terms like **Data Lake**, **EDW** (Enterprise Data Warehouse), **HCERA** (Health
 Try querying the model with any of the example prompts below for a simple introduction to both Vanderbilt-specific and general knowledge queries. The purpose of this 
 model is to allow VUMC employees access to an intelligent assistant that improves and expedites VUMC work. \n
 Feedback and ideas are very welcome! Please provide any feedback, ideas, or issues to the email: **[email protected]**. 
-We hope to gradually improve this AI assistant to create a large-scale, all-inclusive tool to compliment the work of all VUMC staff."""
+We hope to gradually improve this AI assistant to create a large-scale, all-inclusive tool to compliment the work of all VUMC staff- your comments are invaluable in this process."""
 
 GENERAL_ERROR_MSG = "An error occurred. Please refresh the page to start a new conversation."
 
@@ -135,7 +135,7 @@ def chat_api_call(history):
 
     # ** TODO update this next to take and do similarity search on user input!
     st.write(history)
-    search_result = vector_store.similarity_search(query="Tell me about what a data lake is.", k=5)
+    search_result = vector_store.similarity_search(query=st.session_state["messages"][-1]["content"], k=5)
     chat_completion = search_result # TODO update this after we implement our chain
     return chat_completion