You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I'd like to leave after 09:15. Sentence2: What time would you like to depart at? Sentence3: Thanks, that's all I need. Good bye. Sentence4: I have booked a white volvo to leave at 9:15 from Cambridge train station. Your contact number is 07504297575 Sentence5: Where is it that you would like to go? Sentence6: I want to go to county folk museum Sentence7: I want to get a taxi to pick me up from the Cambridge train station please. Sentence8: Great! Have a nice day! Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User