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: In which city?

SOLUTION: Yes

PROBLEM: What kind of food were you looking for and in what city should I look in?

SOLUTION: Yes

PROBLEM: Yes that sounds great. What is the address of the restaurant?

SOLUTION:
Yes