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 eat?

SOLUTION: Yes

PROBLEM: I am hungry and want to make a restaurant reservation.

SOLUTION: No

PROBLEM: Yes, try to make it for 18:30.

SOLUTION:
No