Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Downing College is located in the centre, located on Regent Street. The postcode is cb21dq. The entrance fee is free. Is there anything else I can help you with? Sentence2: I can help with that! What day would you like to depart? Sentence3: You're all set. The fee will be 35.79 GBP and you can pay at the station. Your reference number is HZ0I8VML . Do you need anything else? Sentence4: Noone in the center appears to b open. You would be more than pleased with Jesus College which is and is beautiful. Sentence5: The TR5484 leaves at 18:01 and arrives by 19:01. Will that work for you? Sentence6: No that will be all. Thanks. Good bye. Sentence7: Hey! Trying to locate a train that goes to broxbourne and would leave right after 17:45. Sentence8: Yes, I need 2 tickets. Sentence9: Yes I also need information on downing college. Sentence10: I would like to leave on Tuesday please. Sentence11: Thanks for using our services today. Glad I was able to help have a nice day. Sentence12: I'm really interested in Downing College. Can you tell me the area, address, and fee for that one? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System