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: At what time do you want to go?

SOLUTION: Yes

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

SOLUTION: Yes

PROBLEM: In which city is Cassava restaurant and what time would you like the reservation?

SOLUTION:
Yes