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: I am trying to get to peterborough on Thursday please. Sentence2: Where will you be going and on what day? Sentence3: I was able to book that ticket for you. Your reference number is EMF3A2D0 . Is there anything else I can assist you with today? Sentence4: Yes can you get me the phone number and entrance fee of a museum? It can be located anywhere in Cambridge. Sentence5: I'm departing cambridge . Can you find a train that leaves after 08:15? Sentence6: I am trying to find a museum to go to while I am in Cambridge on holiday. Sentence7: I believe that is all, thank you Sentence8: I have the byard art museum in the south. The phone number is 01223464646 and it is free to enter. Can I help you with anything else today? Sentence9: Have a great day! Sentence10: There are 23 museums in the area of cambridge what area do you want? Sentence11: Yes thank you, I would like to book for one ticket. I would also like the reference number please. Sentence12: There are several museums in Cambridge. Is there a certain area you are hoping to visit? Sentence13: TR4863 leave at 08:34, would that work for you? Sentence14: I have no particular area in mind. Which do you recommend and can I get the entrance fee and phone number please? Question: Who has spoken the sentence 3? (A) User (B) System
Output:
Answer: (B) System