You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

[Q]: Sentence1: Sure, that post code is cb39al. Can I further assist you? Sentence2: I'm interested in visiting colleges while in town, can you please recommend some? Sentence3: I can recommend clare hall and christ's college. You need phone numbers for either one? Sentence4: Okay the TR5009 leaves at 18:40. Sentence5: Yes I also need a train to stansted airport on sunday Sentence6: That sounds great, do I call to book a seat or can you help me? Sentence7: No, thanks. That's all I needed. Sentence8: I'm glad I was able to help you. Thanks for using our service have a nice day. Sentence9: Sure. Where will you be departing from, and what time? Sentence10: Please book for 6 people. Sentence11: I am leaving from Cambridge. I would like to leave sometime after 18:00. Sentence12: I would like the post code for clare hall please. Sentence13: I would be more than happy to help you book! Tickets are 8.08 pounds. How many tickets would you like me to book for your trip? Sentence14: Booking was successful, the fee is 48.48 GBP payable at the station . Reference number is 4ESBHTB0 . Is there anything else I can help you with? Question: Who has spoken the sentence 7? (A) User (B) System
[A]: Answer: (B) System

[Q]: Sentence1: The address of Old Schools is Trinity Lane in the centre. Would you like more info? Sentence2: What kind of attractions are available in the centre? Sentence3: Could I get the address please? Sentence4: You're welcome! Enjoy your visit! Goodbye. Sentence5: How about any that are about architecture? Sentence6: Thank you that is all I needed. Sentence7: Yes, may I have the phone number and postcode? Also, is there an entrance fee? Sentence8: Are there any places that have multiple sports? Sentence9: There is the Holy Trinity Church on Market Street. It is free to get in. Sentence10: The phone number is 01223332320 and the entrance fee is free. The post code is cb21tt. Sentence11: Sorry there are no listings for multiple sports,can I check in another area? Sentence12: There are several. I like Old Schools on Trinity Lane. Great place to see. Question: Who has spoken the sentence 3? (A) User (B) System
[A]: Answer: (B) System

[Q]: Sentence1: Hey, I need a place to stay with free wifi and free parking. Sentence2: I will be happy to book it for you! How many people will be staying? Sentence3: Four people. Thanks. Sentence4: I have several options to offer you, is there an area of town, or price range you'd like? Sentence5: You're welcome. If you need anything else please let us know. Sentence6: Thanks! I really don't care about the area. I need stay in a guesthouse that has free wifi and parking. Sentence7: That sounds nice. Can you get it for four nights starting Thursday? Sentence8: Thanks so much. That is all I need. Bye. Sentence9: I don't mind about the price but I want something with 4 stars . Sentence10: How about the Archway House? it is moderately priced in the north. Sentence11: In order to try to narrow down your options, do you prefer a cheaper place or something moderately priced? Sentence12: I've book the hotel for you for 4 people on Thursday. The reference number is QMOZPFHQ . Question: Who has spoken the sentence 5? (A) User (B) System
[A]:
Answer: (B) System