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: Booking a table for today at Sushi Yoshizumi in San Mateo at 11:30 am for 2 people.

SOLUTION: No

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

SOLUTION: Yes

PROBLEM: Thank you, that's perfect. Do they serve liquor?

SOLUTION:
Yes