TASK DEFINITION: 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.
PROBLEM: Let's make it an evening 7:30 reservation and you should look in San Francisco.

SOLUTION: No

PROBLEM: Do they Tacos there? What's the phone number?

SOLUTION: Yes

PROBLEM: I am sorry, but I was unable to book the reservation. Is there anything else I can help you with?

SOLUTION:
No