You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Thank you, goodbye Sentence2: You're welcome, goodbye. Sentence3: Nandos is a cheap Portuguese restaurant in the south area. The phone number is 01223 327908 and the address is Cambridge Leisure Park Clifton Way Sentence4: I want a cheap portuguese restaurant. Give me their address, phone number, and area, please. Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System