"May I help you?"

YES

Think of the single word you might say when eagerly accepting an offer or confirming a positive choice.

The clue is a simple, polite question someone might ask when offering assistance. The answer "YES" is the direct, one-word response you'd give if you wanted to accept that help. There’s no hidden wordplay or trick here—it’s a straightforward exchange where the clue mimics a real-life conversation, and the answer is the natural reply. Think of it like a shopkeeper asking if you need anything, and you answering with a clear, short confirmation.