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

Sentence1: Saint Johns Chop House matches your request. It is located at 21-24 Northampton Street c.b 3, 0 A.D, the phone number is 01223 353110. Sentence2: How about the West part of town. Sentence3: Thank you goodbye. Sentence4: There are several restaurants serving british food. Would you prefer the centre or west part of town? Sentence5: Thank you, goodbye. Sentence6: I want British food that is moderately priced. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System