You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: da vinci pizzeria is in the north part of town and in the cheap price range. Their phone number is 01223 351707 Sentence2: Thank you. Goodbye. Sentence3: I want to find a cheap restaurant in the north part of town. What is the phone number? Sentence4: Enjoy your dinner! Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System