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

[EX Q]: Sentence1: Maybe you could try again? Sentence2: I am looking for a place to stay in cambridge in the moderate price range with 4 stars Sentence3: I found the restaurant you want. Do you want me to make reservation? Sentence4: I am having a hard time booking this, could I make sure the place you would like is the Pizza Express at Fen Ditton? Sentence5: There are 11 matches. Do you have a preference for hotel types? Sentence6: Yes, for 5 people on Friday around 13:45, please Sentence7: I am not able to book anything right now. Sentence8: Okay....well I'm over here waiting....don't forget the reference number too Sentence9: I will go ahead and book that for you now. Sentence10: Thanks for the room booking. Can you locate a restaurant for me, too? The name is pizza express Fen Ditton. Sentence11: The booking worked this time! The reference number is S31A87TV . Anything else today? Sentence12: No problem. If you need anything else just call us back. Sentence13: Yes it is, but if 13:45 time isn't working then 12:45 would also be acceptable. Sentence14: Great, thanks for your help! Have a good one. Sentence15: You have a room booked at the Warkworth House (ref# TP8X26LA). Can I help you with anything else? Sentence16: No, but it should be in the east. Sentence17: I have 3 guesthouses matching your request. Do you care about parking? Sentence18: Pick one and book me for 5 people lasting three nights starting Friday please. Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I do not have all of that information at this time. Can I talk to you again when I know more? Sentence2: I am looking for a hotel with free parking in the North. Sentence3: Okay. Please help me book this guesthouse. Sentence4: Yes that is all right. Sentence5: Yep there are 5 guesthouses. Do you wanna just try acorn guest house? Sentence6: Are any of those 11 guesthouses? Sentence7: Does it offer free wifi? Sentence8: It's my pleasure. Have a nice trip! Sentence9: What day, number of nights, and number of people would you like to book for? Sentence10: Thank you for your help! Sentence11: Yes, it does have internet. Sentence12: There are 11 hotels that meet your needs. Would you like to narrow them down by price range? Question: Who has spoken the sentence 9? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Great. Can I have the postcode for the Aplha-Milton guesthouse? Sentence2: Thank you. Again, I will be leaving from Stratford around 09:00 going to Cambridge and I would like to know the fair also. Sentence3: Can you tell me about cineworld cinema? I'd like a train into Cambridge on Thursday leaving around 09:00 also. I'll be leaving from Stratford. What is the fair? Thank you. Sentence4: Thank you, goodbye. Sentence5: The alpha-milton guest house is located in the north with postcode cb41xa and is 3 stars. Its phone number is 01223311625. Would you like me to book this? Sentence6: The Alpha-Milton guesthouse is a 3 star guesthouse located in the north. Sentence7: Forget the train for now, I need a 3 star guesthouse. Sentence8: Yes, please book it for me. Sentence9: Actually I don't want to book yet, I just am looking for the postcode and area of a guesthouse with 3 stars and moderately priced. Sentence10: Certainly. The postcode is cb41xa. Can I help you with anything else? Sentence11: Can I have the postcode and phone number, please? Sentence12: You're welcome. Have a great stay. Sentence13: You are all set, have a good time. Sentence14: I'm sorry, there seems to be an error. Would you please restate your requirements? Sentence15: Thanks for everything! Thats all I needed. Sentence16: OK, one at a time. Cineworld Cinema is located at cambridge leisure park, clifton way, in the south part of town. Sentence17: Can you tell me what day you are wanting to start your stay? Sentence18: The postcode is cb17dy and the phone number is 00872208000. Now, let's check on that train. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]:
Answer: (A) User