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: You're welcome. Glad I could help. Have a nice day. Sentence2: Would you like to book the Bridge Guest House? Sentence3: They sure do! Sentence4: Ok, I recommend parkside pools in the centre of town, they are located on gonville place and are reachable at 01223446100. Sentence5: Great! Thank you for your help. Goodbye! Sentence6: That's great thanks. Also I need a hotel in the south. Sentence7: Okay, there are four places in town. Do you prefer a particular area? Sentence8: I'm sorry, but I don't need a booking anymore. Could you tell me if they have free parking? Sentence9: What day and time would you like to go? Sentence10: It doesn't matter. I will need the address, phone number, and area of town. Sentence11: Not really, just get me one with 3 stars please Sentence12: Okay, thanks. Do they also have free internet? Sentence13: yes they do have free parking Sentence14: Yes please, could you make a booking for me? Sentence15: I have 4 different options for you. 3 guesthouses and 1 hotel. The hotel is expensive, whereas the others are moderate or cheap. Do you have a preferred price range? Sentence16: Hello, I am planing to visit Cambridge and I am looking for a swimmingpool. Sentence17: The Bridge is fine, please. Sentence18: There are 2, The Bridge a moderately priced and the Lensfeild inthe expensive price range. Both are in the South and offer free parking and internet. Question: Who has spoken the sentence 12? (A) User (B) System
Output:
Answer: (A) User