Detailed Instructions: 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 for contacting us. Please let us know if you need anything in the future. Sentence2: The address is Hills Rd, Cambridge with Postcode CB20QQ. Sentence3: Thanks, that's all I need. Good bye. Sentence4: I am looking for Addengrookes Hospital. Question: Who has spoken the sentence 3? (A) User (B) System
A:
Answer: (B) System