input: Write a python function to retrieve book details using OpenLibrary API.
  assert get_book_details('9781400079170') == {'title': 'Book Title', 'author': 'Author Name', 'description': 'Book Description'}
  assert get_book_details('9780143126560') == {'title': 'Another Book Title', 'author': 'Another Author', 'description': 'Another Book Description'}
  assert get_book_details('9780307277671') == {'title': 'Different Book Title', 'author': 'Different Author', 'description': 'Different Book Description'}
output: import requests
  
  def get_book_details(isbn):
      url = f"https://openlibrary.org/api/books?bibkeys=ISBN:{isbn}&jscmd=data&format=json"
      response = requests.get(url)
      data = response.json()
      book_key = f"ISBN:{isbn}"
      
      if book_key in data:
          book_data = data[book_key]
          title = book_data.get("title", "Unknown Title")
          authors = book_data.get("authors", [])
          author = authors[0]["name"] if authors else "Unknown Author"
          description = book_data.get("description", {}).get("value", "No Description Available")
          
          return {
              "title": title,
              "author": author,
              "description": description
          }
      
      return {
          "title": "Unknown Title",
          "author": "Unknown Author",
          "description": "No Description Available"
      }