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: Your booking is now completed. Sentence2: You are more than welcome! Sentence3: I want to go to hobsons house from bloomsbury restaurant Sentence4: I need to book a taxi please. Sentence5: No that is all I needed today. Sentence6: I want to leave bloomsbury restaurant after 11:45, please. Sentence7: You will be picked up by a black Audi. The contact number is 07866049938. Is there anything else I can do for you? Sentence8: Goodbye. I really appreciate your help. Sentence9: What are the details for the taxi, please? Sentence10: Okay, what time do you want to leave? Sentence11: Thanks for calling and do call us again. Goodbye. Sentence12: Where would you like to go to and from? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System