instruction:
You are given a sentence from a conversation between a human and a virtual assistant. Your task is to identify whether the sentence is a question or not. Answer with Yes or No.
question:
Why not? Sure. I can help you on that. At what time you wish to reserve the table?
answer:
Yes


question:
I'd like to make a dinner reservation.
answer:
No


question:
What city do you want me to look in?
answer:
Yes