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

Sentence1: I want to be picked up at riverboat georgina around 11:15. I need to get to cambridge arts theatre. What is the car type and the contact number? Sentence2: I need to arrive by 11:15. Sentence3: Ok, what time do you want to arrive by? Sentence4: Nothing else for now. Thank you for booking the taxi. Goodbye. Sentence5: Ok, What time do you want to be picked up? Sentence6: Your taxi has been booked, you will be riding a white tesla with the contact number 07492127564. Is there anything else I can help you with today? Sentence7: Please have a taxi pick me up from riverboat georgina Sentence8: Thank you for contacting us and have a nice day. Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System