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

Sentence1: Please help me find somewhere to eat in the centre Sentence2: Alright. Sounds good. I look forward to your call. Sentence3: I'm not ready to book yet. Thanks, I will give you a call back. Goodbye. Sentence4: You could try the yippee noodle bar, which is asian oriental, and priced moderately. It is located at 40428 King Street City Centre. Sentence5: The postcode is cb21rq. Would you like me to make a reservation? Sentence6: That sounds great. Can I get a postcode? Thanks! Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User