You will be given a definition of a task first, then some input of the task.
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.

I'm sorry to say that I was unable to make a reservation at Mister Jiu's for 1 person at that time. Shall I make the reservation for today at 6:30 pm instead?
Output:
No