You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: The taxi should leave by 3:15. Sentence2: It was a pleasure to help you. Sentence3: I need to book a taxi from Saint Johns Chop House to Williams Art and Antiques please. Sentence4: No problem, a blue lexus will pick you up at 3:20. The contact number is 07581540721. Will there be anything else? Sentence5: That should be perfect! Sentence6: Thank you let me know if you need anything else. Sentence7: I'm sorry, could you make sure the taxi is actually leaving after 3:15? I made an error earlier. Sentence8: I have booked a taxi for you! The car is a yellow honda. The contact number is 07799036655. Is there anything else you need today? Sentence9: Thank you so much! Sentence10: Not a problem, I will need your preferred pick up and arrival times in order to book your cab. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System