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.

Example Input: Please confirm this: The city is Hayward. The reservation is at 6:45 pm.
Example Output: No

Example Input: No, make it for two people.
Example Output: No

Example Input: I'll need more details to assist you. Which city would you like me to search, and for what time will you be making the reservation? Is there a preferred restaurant or type of food you prefer?
Example Output:
Yes