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

Sentence1: Sure. Where are you traveling too and what time would you like to leave? Sentence2: No preference on departure time, but I will need to book for 5 people. Sentence3: I have 4 trains that will arrive by 9:15 in Cambridge. What time would you like to depart Stansted Airport? Sentence4: The admission is free. Sentence5: Ok, thanks. Can I get the phone number and postcode as well? Sentence6: Post code is cb23bu and phone number is 01223334900. Is there anything else I can assist you with today? Sentence7: That is everything thank you. Sentence8: It was my pleasure to help. Have a good day. Sentence9: There are several colleges in the centre. May I suggest christ's college or downing college, both have free entrance fees. Sentence10: Yes, I'm looking for a college to visit in the centre of town. Sentence11: I need a train departing from Stansted Airport on Friday. Sentence12: Reference number is : 1LD6SOW1 . Anything else? Sentence13: what's the entrance fee for christ's college? Sentence14: I need to arrive in Cambridge by 9:15. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System