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

Sentence1: I'm sorry, I lied about having a wife. I just need to know if there are any trains to stevenage available on monday. Sentence2: Yes, could you book a table for 4 people at 14:45 on sunday? Sentence3: I need that information emailed or faxed to me, please. Sentence4: I think that is all the info I will need. Sentence5: What about your wife? Does she need a ticket? Sentence6: The train should arrive by 15:30 and should depart from cambridge. Sorry still no wife. Sentence7: Unfortunately, there are not any Tuscan restaurants in town at all. Is there another type of cuisine you would enjoy? Perhaps maybe Italian? Sentence8: I do not have a fax machine. Sentence9: Royal standard is available, would you like to try them? Sentence10: It's fine. I'm over needing a fax machine. I think I've got everything I need. Sentence11: Can you tell me about any expensive places to dine in the east side? Sentence12: Great! Let me ask my wife if there was anything else she was curious about. Sentence13: OK, I'll be here! Sentence14: Are there any expensive restaurants in the east that serve gastropub food? Sentence15: There are several. Is there a certain type of food you would like to have? Sentence16: Unfortunately, we do not have that capability. If we do a booking for you, we can provide you with a reference number though. Sentence17: I would like to go to a Tuscan restaurant, please. Sentence18: I was able to do that. Your reference number is 1CYX3L33 . Sentence19: The TR1898 meets your criteria. The departure time is 13:21. The duration of the trip is 49 minutes. Sentence20: No. I just need the train ID and departure time, please. Sentence21: Great. I hope you and your wife have a great trip. Sentence22: Where are you leaving from? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System