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

[EX Q]: Sentence1: Your very welcome! Enjoy your stay! Sentence2: I'm sorry, but they don't have a room for that long. Would you like to shorten your stay? Sentence3: Great! That worked and your confirmation code is 4MI69WKV . Sentence4: Sure and I would like the address also. Thanks Sentence5: I need booking information,how many people,what day,and how many days you would like to stay. Sentence6: The arbury does have 4 stars. It is moderate priced. Would you like that one? Sentence7: You are welcome. If you need anything in the future, please let us know. Sentence8: Excellent! Now, what can you tell me about the Da Vinci Pizzeria? Sentence9: Have a great day! Thank you for your help! Sentence10: Sure, let's try 2 nights instead. Sentence11: No, that's all I need today. Thanks for all your help! Sentence12: Yes please that sounds good. Sentence13: Oh, wait, I don't think I completed the booking at Da Vinci Pizzeria we were talking about. If you'd still like it I'll need a time, day, and number of people. Sentence14: I am looking to stay for 1 person, 4 nights, starting wednesday. Sentence15: No that's ok. I just needed the address, no booking. Thank you! Sentence16: The Arbury lodge guesthouse should work out for you. Sentence17: It is located at 20 Milton Road Chesterton and offers Italian food at low cost. Would you like me to make a booking? Sentence18: Hi, I'm actually looking to stay at a luxury guesthouse. Sentence19: does it have a rating of 4 stars? Sentence20: Absolutely, I have made the booking and the address is 20 Milton Road in Chesterton. Is there anything else I can help you with? Question: Who has spoken the sentence 9? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I need help, i just been the victim of a robbery. Sentence2: You are most welcome! Sentence3: Sure, here it is: Parkside, Cambridge. Sentence4: I am not hurt but I need to get in touch with the police, can you send me the address? Sentence5: Are you hurt? Sentence6: Thank you for your help Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Where will you be departing from? Sentence2: Can I look up anything else for you? Sentence3: I don't need it booked at this time. Thanks for the information. Sentence4: how about acorn guest house? it's lovely Sentence5: Is it available for 7 people for 4 nights starting from Friday? Sentence6: OK. Please let me know if you need anything else. Sentence7: You, too. Thank you for calling. Goodbye. Sentence8: Booking was successful. Reference number is : 98H31LT2 . Sentence9: I do not have anything there. Any other place you might like or criteria? Sentence10: Thanks! I think that's all I need, but let me check with my wife. Sentence11: The TR4351 from Leicester to Cambridge on Friday departs at 15:09 and arrives at 16:54. There are some that are earlier as well. Shall I book it for you? Sentence12: I will be departing from Leicester on Friday. Sentence13: Ah, she reminded me, I need a train to Cambridge that arrives by 17:45. Can you recommend one, please? Sentence14: No thanks, I don't need anything else right now. Have a great day though! Sentence15: I need a hotel with free parking and a four star rating. Should also be in the east. Sentence16: Yes try the north please. Sentence17: I need a place to stay out in Cambridge. Can you help me book one? Sentence18: I just need more information to find the perfect place for you. What area are you interested in staying in and the price range? Question: Who has spoken the sentence 16? (A) User (B) System
[EX A]:
Answer: (A) User