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: No, that's all I need from you today, Thanks a bunch! Sentence2: The earlest I have leaving is train TR7713 at 19:27,will this be okay for you? Sentence3: There are nine I recommend allenbell it's a 4 star guesthouse. Would you like the address and phone number or me to book it for you? Sentence4: Thank you. Feel free to call back if you need assistance. Sentence5: Can you give me the phone number and postcode please? Sentence6: A guesthouse in the east, please Sentence7: Yes, I am waiting for my system to load I will have that for you shortly. Sentence8: Oh, not Ely, sorry. I need to leave after 16:00 going to London Liverpool Street. Sentence9: That is good, I also need a place to stay with a cheap price and free parking. Sentence10: 01223210353 is the phone number. The postcode is cb13js. Can I help with anything else? Sentence11: Ok, and where are you heading to? Sentence12: Um, ok. Are you read to give me that information now? Sentence13: I am trying to find when the train is leaving Sunday Cambridge can you help me? Sentence14: What time do you want to arrive by? Sentence15: I am heading to Ely. Sentence16: I have several hotels in your price range with free parking, what area would you like? Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User