Update app.py

app.py

@@ -112,7 +112,7 @@ def initialize_index():
 def initialize_chat_engine(index):
     from llama_index.core.prompts import PromptTemplate
     from llama_index.core.chat_engine.condense_plus_context import CondensePlusContextChatEngine
-    retriever = index.as_retriever(similarity_top_k=1)
+    retriever = index.as_retriever(similarity_top_k=3)
     chat_engine = CondensePlusContextChatEngine.from_defaults(
         retriever=retriever,
         verbose=True,