Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Okay, and what is your destination? Sentence2: You're welcome. Is there anything else I can do for you? Sentence3: I booked that taxi for you. The car is a red honda and the contact number is 07091293811. Sentence4: I would like to go to a Shanghai family restaurant please. Sentence5: I need a tax departing from Kambar and arriving by 23:15. Sentence6: No thank you, that is all I'll be needing for now. You were great, thank you again for helping me! Sentence7: Thank you for you assistance! Sentence8: Thank you for using this system! Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System