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.

Ex Input:
I was unable to make that reservation. Can I help with anything else?

Ex Output:
No


Ex Input:
Can you tell me if the prices are inexpensive?

Ex Output:
Yes


Ex Input:
No.Its book for 1 person.

Ex Output:
No