style: format code with Autopep8, Black, ClangFormat, dotnet-format, …

…Go fmt, Gofumpt, Google Java Format, isort, Ktlint, PHP CS Fixer, Prettier, RuboCop, Ruff Formatter, Rustfmt, Scalafmt, StandardJS, StandardRB, swift-format and Yapf

This commit fixes the style issues introduced in 896f93f according to the output
from Autopep8, Black, ClangFormat, dotnet-format, Go fmt, Gofumpt, Google Java
Format, isort, Ktlint, PHP CS Fixer, Prettier, RuboCop, Ruff Formatter, Rustfmt,
Scalafmt, StandardJS, StandardRB, swift-format and Yapf.

Details: None

customer_service/chatbot.py

@@ -1,5 +1,6 @@
 import time
 
+
 class Chatbot:
     def __init__(self, nlp_model, knowledge_base):
         self.nlp_model = nlp_model
@@ -9,6 +10,6 @@ def chat(self, user_input):
         entities = self.nlp_model.extract_entities(user_input)
         intent = self.nlp_model.extract_intent(user_input)
         response = self.knowledge_base.get_response(intent)
-        print('User:', user_input)
-        print('Chatbot:', response)
+        print("User:", user_input)
+        print("Chatbot:", response)
         time.sleep(1)