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: That will be all for today thanks ! Sentence2: Yes please book a seat and send me a reference number. Sentence3: Does it leave on Sunday? Sentence4: I'd recommend the acorn guest house. It has free wifi and parking. Would you like to book a room? Sentence5: I have booked you a seat and the reference number is : 6IJ7W2BN . Sentence6: Awesome. Thank you for using the Cambridge TownInfo centre. Have a great day Sentence7: 01223353888 is the number, the post code is cb41da. Can I help with anything else today? Sentence8: Thanks so much. Can you also find me a place to stay? Sentence9: No that's ok. Can I just get the phone number and postcode? Sentence10: Definitely - we have 33 great places to stay in town. If you can give me some specific requirements, I can narrow it down to the perfect place for you. Sentence11: Can you please find me a train that leaves to bishops shortford? Can it also arrive before 10:45 too? Thankyou for your time. Sentence12: No, that one leaves on Friday. TR9219 leaves Sunday at 5:29 and arrives in Cambridge by 6:07. Would you like to book a seat? Sentence13: I would like a 4 star moderately priced guesthouse in the north. Sentence14: I have the TR2061 that arrives at 06:07. Will that work? Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System