Update dataset card: fix task_categories and add train split

README.md

@@ -110,7 +110,7 @@ print(f"Number of turns: {len(conv['turns'])}")
 ### Example: Iterating Through Turns
 
 ```python
-conversation = dataset["train"][0]
+conversation = dataset[0]
 
 for turn in conversation['turns']:
     print(f"Turn {turn['turn_id']}: {turn['user_utterance']}")
@@ -123,11 +123,11 @@ for turn in conversation['turns']:
 ### Example: Accessing Initial State
 
 ```python
-conversation = dataset["train"][0]
+conversation = dataset[0]
 initial_entities = conversation['initial_entities']['seed_data']
 
 # Access pre-existing clients
-if 'Client' in initial_entities:
+if initial_entities and 'Client' in initial_entities:
     for client_id, client_data in initial_entities['Client'].items():
         print(f"Client: {client_data['name']} ({client_id})")
 ```