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

Sentence1: I am going to cambridge on friday, leaving from norwich and I need to book 5 tickets. And can you please give me the reference number? Sentence2: I just need to arrive by 16:30 find a time close to that and help me get 5 tickets please. Sentence3: You are welcome, enjoy your stay in Cambridge. Sentence4: I have booked you on the TR4828 departing Norwich from Cambridge at 14:16 and arriving by 15:35, the total is 88GBP and your reference number is HXYMACBP . Sentence5: Could you book a table for me there please? 5 people on Friday at 20:00. Sentence6: It is a chinese food in the centre. It is expensive and located at 21 Burleigh Street City Centre. Sentence7: Is there a arrive or leave by time you prefer? Sentence8: Thank you! I think that's all I need for now. Sentence9: Yes, I need to leave Norwich on Friday. Sentence10: I have 10 trains that will have you arriving by 16:30. Do you have a specific departure time? Sentence11: I am showing 791 entries that will fit your criteria . Is their a specific day or departure location you would like ? Sentence12: I am looking for a train that goes to Cambridge and arrives by 16:30. Sentence13: I also need help looking up a restaurant called hk fusion. Sentence14: The booking was successful. The table will be reserved for 15 minutes. Reference number is YB8DRR8X . What else may assist you with? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System