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: Thank you, I am also looking to book a taxi to commute between these places. I will be leaving the attraction around 12:45. Sentence2: Here is the address colville road, cherry hinton. Sentence3: Awesome. Thanks so much for your help today! Sentence4: I'm looking to stay at a 4 star place with free wifi. Sentence5: There are 5 options in the north. Sentence6: Phone number is:01223576412 and the postcode is cb19ej. Can I help you with anything else? Sentence7: Are any in the North? Sentence8: Booking completed! Booked car type : blue tesla Contact number : 07305330660 Sentence9: Thank you for contacting the Cambridge TownInfo centre. Goodbye Sentence10: I am also looking for an attraction called the cherry hinton village centre. Do you have any information about this place? Sentence11: OK, can you book a room for me at your favorite place? 4 of us will arrive on Tuesday, and we need to stay for 3 nights. Sentence12: Reference number is : NBAUDV7Y . Is there anything else you need? Sentence13: I have 21 options like that. Would you prefer a certain area of town or price range? Sentence14: Great, can I also have the postcode and phone number? Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System