Update utils.py

utils.py

@@ -6,6 +6,7 @@ from   langchain_community.vectorstores import FAISS
 from   langchain_core.runnables    import RunnablePassthrough
 from   langchain.llms.base         import LLM
 from   langchain.chat_models       import ChatOpenAI
+from   langchain_core.prompts      import ChatPromptTemplate
 from   langchain.prompts           import PromptTemplate
 from   langchain.schema            import StrOutputParser
 from   langchain.utils             import get_from_dict_or_env