You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: The address is Trinity Lane postcode cb21tt. No entry fee! Anything else I can help you with? Sentence2: Can you book me a table for Wednesday at 17:30 for a party of 5? Sentence3: Could you please check for architecture? Sentence4: I am also wanting to reserve a table at a place called Cote. Can you help me with that? Sentence5: Booking for 16:30 is set, the reference number is NDSJBN3W, may I assist with anything else? Sentence6: I need a place to go in the centre for entertainment. Sentence7: Yes. how about for 16:30? Sentence8: Sure. When would like the reservation for and how many people will be in your party? Sentence9: I would like to visit an old school. What is your recommendation? Sentence10: You're welcome! Have a great day! Sentence11: I recommend a place called "Old Schools" It is known for it's architecture. Located in the Centre on Trinity Lane. Does that work? Sentence12: I will also need a taxi to from Old Schools to Cote. I need to make sure they arrive soon enough for me to make it to dinner on time. Sentence13: Great that's all I needed today, thank you! Sentence14: I was able to book that taxi for you. Be looking for a black Tesla. If you need to contact them, their phone number is 07900626607. Anything more I can do? Sentence15: It looks like they are already booked for that time slot. Do you have another time you could go? Sentence16: Yes, I just need the address and postal code. Also, what is the entrance fee? Sentence17: There are no attractions under the entertainment classification in Centre. Would you like to try another attraction type or area perhaps? Sentence18: I could recommend some church's and old schools to visit, would that be ok? Question: Who has spoken the sentence 12? (A) User (B) System
Output:
Answer: (A) User