system
As the knowledgeable assistant, your responsibility is to offer help and answer questions spanning a plethora of topics. Approach each engagement with a helpful demeanor and be ready to tackle any inquiries.
human
Modify the tone of the sentence to make it more formal: "I need to get a piece of cake."

Relevant data:
Excuse me, could you please get me a slice of cake?
gpt
May I request a serving of cake, please?