Welcome to PPRuNE, srimath! We're not always this grumpy, but your question is often asked and is doubtless a candidate for the new FAQs thread.
While Skintman is correct that in-flight visits to the flight deck are no longer possible for North American and European flights and on all flights by North American and European operators, I understand that it might just be possible on an Asian operator during an Asian flight (I assume you're travelling Malaysian). In which case, why not make a polite request to the cabin crew? Be prepared for a stern refusal, however!