TASK DEFINITION: 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.
PROBLEM: Thanks a lot, I won't be needing any more help.

SOLUTION: No

PROBLEM: Works for me. How pricey are they?

SOLUTION: Yes

PROBLEM: Yes that works, do they serve liquor?

SOLUTION:
Yes