Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: I have found TR1530 that leaves cambridge on thursday at 12:36 and arrives in norwich at 13:55. Can I book a seat on this train for you? Sentence2: No that's all you can help me with. Sentence3: Well, Thursday. Have to get there from Cambridge by 14:30. Sentence4: I'm looking for information on la tasca. Sentence5: I'll be happy to book a train to Norwich for you. On what day and time would you like to travel? Sentence6: How many people will be dining with you? Sentence7: No thank you, I just need the travel time. Sentence8: I also need to get to Norwich on Thursday and I need to be there at or just before 14:30. Sentence9: It serves Spanish food and is located in the centre of town. Sentence10: Have a great day! Sentence11: I need a booking for 4 people at 12:00 on wednesday. Sentence12: Great! Can I book a table for lunch Wednesday? Sentence13: Okay! Travel time is 79 minutes. Can I help you with anything else? Sentence14: Your reservation is all set! Your reference number is PN280GZ3 . Do you need anything else? Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System