You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Hi, could you help me find a taxi out of cocum? Sentence2: Could you tell me when you would like to leave by and when you would like to arrive? Sentence3: I need to be picked up by 15:00. Could you provide me the car type and contact number, please? Sentence4: OK, I can make that change. Sentence5: Thanks, I will call them. Can you tell me what type of car I will have? Sentence6: When will the car arrive? Sentence7: Your car type is a white tesla. Sentence8: Unfortunately, it does not give me a specific arrival time. But if you like, you can call them to get that information. Their phone number is 07916703661. Sentence9: Great. Thank you for calling. Sentence10: What is your final destination? Sentence11: Great Thank you. That is all I need to know. Sentence12: Oh, I'm sorry. I would like to travel to Gallery at Twelve a High Street. I actually need to be there by 15:00. Question: Who has spoken the sentence 7? (A) User (B) System
A:
Answer: (B) System