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: Does that restaurant serve alcohol?

SOLUTION: Yes

PROBLEM: Let me double check. This is a reservation for a table at Amami Sushi in San Bruno at 5:30 pm tomorrow for 2 people.

SOLUTION: No

PROBLEM: Is there a restaurant you prefer?

SOLUTION:
Yes