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: Can you give me their phone number?
Example Output: Yes

Example Input: What's their phone number?
Example Output: Yes

Example Input: I'm sorry, the reservation could not be booked. Will Sushi is a nice establishment. Should I try to make another reservation for 1 on next Monday at 11:30 am instead?
Example Output:
No