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:
What is their phone number and are they above average in pricing?
answer:
Yes

question:
Thanks, that's everything for now.
answer:
No