diff --git a/examples/union/run.py b/examples/union/run.py
index 3ea01cb..31b73c8 100644
--- a/examples/union/run.py
+++ b/examples/union/run.py
@@ -3,30 +3,37 @@ from typing import Union
 import instructor
 from openai import OpenAI
 
+
 class Search(BaseModel):
     """Search action class with a 'query' field and a process method."""
+
     query: str = Field(description="The search query")
 
     def process(self):
         """Process the search action."""
         return f"Search method called for query: {self.query}"
 
+
 class Lookup(BaseModel):
     """Lookup action class with a 'keyword' field and a process method."""
+
     keyword: str = Field(description="The lookup keyword")
 
     def process(self):
         """Process the lookup action."""
         return f"Lookup method called for keyword: {self.keyword}"
 
+
 class Finish(BaseModel):
     """Finish action class with an 'answer' field and a process method."""
+
     answer: str = Field(description="The answer for finishing the process")
 
     def process(self):
         """Process the finish action."""
         return f"Finish method called with answer: {self.answer}"
 
+
 # Union of Search, Lookup, and Finish
 class TakeAction(BaseModel):
     action: Union[Search, Lookup, Finish]
@@ -35,6 +42,7 @@ class TakeAction(BaseModel):
         """Process the action."""
         return self.action.process()
 
+
 try:
     # Enables `response_model`
     client = instructor.patch(OpenAI())
@@ -43,10 +51,9 @@ try:
         response_model=TakeAction,
         messages=[
             {"role": "user", "content": "Please choose one action"},
-        ]
+        ],
     )
     assert isinstance(action, TakeAction), "The action is not TakeAction"
     print(action.process())
 except Exception as e:
     print(f"An error occurred: {e}")
-