You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: TR8913 will leave at 9:21 and arrive by 10:10. Do you want to book a seat? It will cost 12.80 pounds. Sentence2: The Express by Holiday Inn Cambridge meets your description. Would you like to make a booking? Sentence3: Is that leaving from cambridge? What day would you like to leave? Sentence4: Do you need help with anything else? Hotel, attraction, etc? Sentence5: Yes, I'm leaving from Cambridge on Wednesday. Sentence6: I do not want to book it. I just need the postcode. Sentence7: I need a train leaving after 8:15 going to stevenage. Sentence8: I'd be happy to help. Is it just you, or will you have other guests? And for how many days will you be staying? Sentence9: Any area would work. It needs to be a 2 star hotel. Sentence10: Yes, please book it for me. Sentence11: Their postcode is cb13lh. Can I help with anything else? Sentence12: Yes, a place to stay/ I am treating myself so make it an expensive one with free parking. Sentence13: That's all I needed. Sentence14: No that is all I need for now. Sentence15: Can you tell me what area you would like to stay in please? Sentence16: Ok great, have a fantastic day! Question: Who has spoken the sentence 3? (A) User (B) System
A:
Answer: (B) System