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: Booking completed! Booked car type : red audi Contact number : 07547694043 Sentence2: I'd like to book a taxi, please. I need to get from the lensfield hotel to peking restaurant. Sentence3: I would like for the taxi to arrive by 06:15. Sentence4: What time do you want to be picked up at the lensfield hotel? Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System