diff --git a/app.py b/app.py
index afb0b96..a4b1c50 100644
--- a/app.py
+++ b/app.py
@@ -1,15 +1,33 @@
 from langchain import PromptTemplate, LLMChain
+from langchain.chains import RetrievalQA
 from langchain.chat_models import ChatOpenAI
 
 import chainlit as cl
 
+from utils import get_docsearch
+
 template = """Input: {question}
 Output: Let's think step by step."""
 
 
 @cl.langchain_factory(use_async=True)
-def factory():
-    prompt = PromptTemplate(template=template, input_variables=["question"])
-    llm = ChatOpenAI(model_name="gpt-3.5-turbo")
-    llm_chain = LLMChain(prompt=prompt, llm=llm, verbose=True)
+async def factory():
+    files = None
+    while files is None:
+        files = await cl.AskFileMessage(
+            content="Select File",
+            accept=["text/plain", "application/pdf"],
+            max_size_mb=20,
+            timeout=180,
+        ).send()
+    file = files[0]
+    msg = cl.Message(content=f"Processing `{file.name}`...")
+    await msg.send()
+    docsearch = await cl.make_async(get_docsearch)(file)
+    llm_chain = RetrievalQA.from_chain_type(
+        ChatOpenAI(temperature=0, streaming=True),
+        chain_type="stuff",
+        retriever=docsearch.as_retriever(max_tokens_limit=4097),
+    )
+    await msg.update(content=f"`{file.name}` processed. You can now ask questions!")
     return llm_chain
diff --git a/chainlit.md b/chainlit.md
new file mode 100644
index 0000000..e69de29