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

[EX Q]: Sentence1: Not really. Would you see if the highest rated, least expensive guesthouse has rooms for 5 nights for 6 people, beginning Wednesday? Sentence2: I would like to stay in a guesthouse that is in the south. Sentence3: I was able to book Rosa's Bed and Breakfast for you for 5 nights for 6 people starting on Wednesday. The reference number is RTITW2L5 . Sentence4: I am traveling to London Liverpool Street from Cambridge. Sentence5: There are 10 trains that meet your criteria. Do you have a preferred time that you would like to arrive by? Sentence6: Of course! The best option is the TR7092 leaving at 17:59 with a duration of 88 minutes. The price is 16.60 pounds. How else may I assist you? Sentence7: Yes, I was wondering if you could assist me in finding a train for Monday. Sentence8: There are 2828 trains available Monday. Where are you traveling to? Sentence9: I have found 29 hotels that fit your criteria for parking. What price range are you looking for? Sentence10: There are three guesthouses in the south with free parking in the moderate and cheap price ranges. Do you have a star or price range preference? Sentence11: I'd like to find somewhere to stay with free parking; I'm planning to rent a car during my stay. Sentence12: It was my pleasure to help. You have a great day. Goodbye. Sentence13: Thank you. I believe that is everything I need today. Sentence14: Yes, I need to leave after 17:30, please. I don't need tickets right now, I'll just need the price, travel time, and train ID. Question: Who has spoken the sentence 2? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I'd like to dine in the center of town, please. Sentence2: Could you give me the address and phone number for the Slug and Lettuce please. Sentence3: I'm looking for a place to dine that serves gastropub food. I want it to be expensive. Sentence4: You're quite welcome! Thanks for contacting the Cambridge TownInfo Centre and have a great day! Sentence5: The slug and lettuce is located at 34 - 35 Green Street, postcode cb23ju. I'm sorry our system does not list their phone number. Is there anything else? Sentence6: I have two in the centre, the Backstreet bistro and The Slug and Lettuce. Would you like for me to make you a reservation? Sentence7: I wish you could provide their phone number. But other than that you've given me everything I need to know. Thank you goodbye. Sentence8: We have 3 options in Cambridge for expensive gastropub food. Would you prefer a place in the centre or in the east? Question: Who has spoken the sentence 3? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: No, that is all I need. Thank you for your help! Sentence2: I am looking for a vegetarian restaurant near South Cambridge, or a restaurant that has a variety of vegetarian dishes. Sentence3: What is the area that is in? Sentence4: Free parking isn't that expensive to me, are there any others or just the University Arms? Sentence5: You are welcome! Have a wonderful day! Goodbye! Sentence6: How many nights will you be staying? Sentence7: Please book the Marriott for 4 please. Sentence8: I'm sorry, I'm experiencing a system error. Could you please restate your request? Sentence9: Yes, I also need a place to stay I need a hotel that is expensive. Sentence10: I have 5 hotels in total to choose from. We have a Marriott in the expensive price range in Cambridge if you are interested. Sentence11: University arms hotel is also in the centre area in the expensive price range. Free parking and internet. Would you like to book a room? Sentence12: Sure, its on 2 Norfold Street. Anything else? Sentence13: It is in the centre of the city. Can I help you with anything else? Sentence14: Does it have internet? Sentence15: Yes, the Huntingdon Marriott has internet, would you like more information on this hotel? Sentence16: Uh, can you tell me where the Man on the Moon exhibit is? Sentence17: the huntingdon Marriott is a 4 star hotel on the west side. It is in Hinchinbrook business park and the phone number is 01480446000. Can I help with anything else? Sentence18: I'm not sure yet. I actually just need the info. Sorry. Sentence19: Is it in the centre? If it is, I would like to book it. Sentence20: No it is in the west. Do you wanna book it? Would you like to try university arms hotel instead, that is also in the centre. Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]:
Answer: (B) System