Fix example

docs/examples/amazon-dynamodb-sessions.md

@@ -7,6 +7,7 @@ In this example, we will show you how to use the [AmazonDynamoDbConversationMemo
 This code implements the idea of a generic "Session" that represents a Conversation Memory entry. For example, a "Session" could be used to represent an individual user's conversation, or a group conversation thread.
 
 ```python
+import sys
 import os
 import argparse
 
@@ -17,13 +18,12 @@ from griptape.drivers import (
 from griptape.structures import Agent
 from griptape.memory.structure import ConversationMemory
 
-parser = argparse.ArgumentParser()
-parser.add_argument("input", type=str, help="The input to be passed to the Structure.")
-parser.add_argument("session_id", type=str, nargs="?", default="default-session-id", help="The session identifier.")
-args = parser.parse_args()
-
-input = args.input
-session_id = args.session_id
+if len(sys.argv) > 2:
+    input = sys.argv[1]
+    session_id = sys.argv[2]
+else:
+    input = "Hello!" # Default input
+    session_id = "session-id-123" # Default session ID
 
 structure = Agent(
     conversation_memory=ConversationMemory(