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: I forgot something. I need to arrive by 21:00. Sentence2: I need to book a taxi from kirkwood house. Sentence3: What type of car is it going to be? Sentence4: I have booked you a taxi. The contact number is 07866666313. Can I do anything else for you today? Sentence5: What will your destination be? Sentence6: The car arriving will be a white BMW. Sentence7: Is there anything else you need to know? Sentence8: I'm going to efes restaurant. Question: Who has spoken the sentence 2? (A) User (B) System
Answer: (A) User