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: What time did you want the reservation for?

SOLUTION: Yes

PROBLEM: I think not. Thanks for your diligence.

SOLUTION: No

PROBLEM: What city should I search? Do you have a particular time in mind?

SOLUTION:
Yes