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: Yes that works for me. Do you know if they serve liquor? Also, can i get the contact number please?

SOLUTION: Yes

PROBLEM: No problem. What time would you like a reservation for?

SOLUTION: Yes

PROBLEM: Thanks, a lot. That'll do it, for now.

SOLUTION:
No