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

Sentence1: I just need a phone number, thanks Sentence2: That is all I needed. Thank you for your help. Sentence3: You're welcome. If you ever need anything else just let us know. Sentence4: The number is 01223245151. Can I help you with something else? Sentence5: Addenbrookes Hospital is located at Hills Rd, Cambridge, is there a particular department you're looking for? Sentence6: Thanks again. Goodbye. Sentence7: welcome. at your service next time Sentence8: Yes, I am looking for a hospital that is here in town. Question: Who has spoken the sentence 6? (A) User (B) System
Answer: (A) User