You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: No, I just need the price and arrival time. Sentence2: Not at this time. Thanks for the information. Sentence3: The price is 17.60 pounds, and travel time is 79 minutes. Do you need to reserve a seat? Sentence4: My destination is Norwich. I am hoping I could catch a train after 15:15. Sentence5: TR9460 leaves cambridge Monday at 15:36, would you like to reserve a seat? Sentence6: More specifically, the train arrives in Norwich at 16:55. If there is nothing more, thank you for calling. Goodbye. Sentence7: I am looking for a train from cambridge on monday. Sentence8: Will you be traveling alone? Sentence9: Yes. I will be by myself. Looking for one ticket please. Sentence10: Where is your destination, please? Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System