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: Please confirm change to 1:15 pm for 1.

SOLUTION: No

PROBLEM: Yes, sounds great. Do they serve liquor at the restaurant?

SOLUTION: Yes

PROBLEM: In which city and do you have a preferred restaurant?

SOLUTION:
Yes