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: Is there a preferred restaurant you are looking to make reservations at and what city will this be in?
Example Output: Yes

Example Input: What kind of food are you looking for? Italian, American, what?
Example Output: Yes

Example Input: sorry I could not make a reservation at that time. They are a French Restuarant. Shall I try to book a reservation for 2 today at 6 pm at Bistro Liaison?
Example Output:
No