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: OK, TR1584 costs 17.60 pounds and leaves at 9:36. The travel time is 79 minutes. Would you like me to book it? Sentence2: No, I'll think about it. I will also need a place to stay 3 star please and free wifi. Sentence3: I'd like to go to Norwich. Sentence4: There are 202 trains leaving from Cambridge that day. Where would you like to travel to? Sentence5: There are no hotels with the moderate price range, but we do have three different guesthouse in the moderate price range with a 3 star rating. Sentence6: Yes, what moderate hotels are in the area? Sentence7: Cheap price range please Sentence8: There are 19 trains available on Thursday. What time would you like to travel? Sentence9: Glad I could be of service, goodbye. Sentence10: Fantastic, I have booked you at the Bridge Guest House. Your reference no. is 7XMDDV3L . Is there anything else I can help you with today? Sentence11: I would like to book a train from Cambridge on Thursday. Sentence12: I would like to leave on the first train after 9:30. Can I get the travel time, train ID and price please? Sentence13: No thank you goodbye. Sentence14: There are no cheap hotels with 3 stars and free wifi. Would you be interested in a moderately priced one instead? Sentence15: There are 5 hotels that meet your criteria. Are you looking for a certain price range or part of town? Sentence16: Can you book one for me? I need a room for 5 people starting on Monday. We would be staying 3 nights. Question: Who has spoken the sentence 3? (A) User (B) System
Output:
Answer: (B) System