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

Sentence1: Could you give me the postcode, address please? Too bad it doesn't mention the entrance fee, but I will call them. Sentence2: Thank you for using our service today! Sentence3: That will work. Can you book me 2 seats, please? Sentence4: I can help you find a train but need more information. What day do you need the train and where are you traveling to? Sentence5: It is at Gonville Place. I'm not sure how much it is to enter the pool. 01223446100 is the phone number that could give you further information. Sentence6: Sure thing, this is the pool in the centre parkside pools. Sentence7: Booking was successful, the total fee is 28.64 GBP payable at the station. Reference number is : 8RMLZ0N0 . Is there anything else I can help with? Sentence8: Ok that sounds like what we need Sentence9: I would like to leave on Saturday, leaving from cambridge, and I would like to arrive by 17:45. Sentence10: Can you help me find a train going to Broxbourne? Sentence11: Yes, could you recommend a swimming pool in the centre? Sentence12: The address is Gonville Place, postcode cb11ly. What else can I help you with today? Sentence13: That is all. Thank you so much! Sentence14: Okay the TR8252 arrives by 17:45. Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System