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

Sentence1: How about the Gonville Hotel located in the centre area of town? Sentence2: Between $100-$300 per night. Sentence3: I have several available. What is your price range? Sentence4: Ok, I have several hotels. Any particular location? Sentence5: Location doesn't really matter as long as there's free parking available. Sentence6: What is their postcode? Sentence7: I need a place to stay with free wifi. Sentence8: Their postcode is cb11Iy, address gonville place, phone 0122336661 they have wifi and free parking too. Would you like me to book this for you? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

Sentence1: Then you are all set? Sentence2: I booked you a black volvo. The driver can be reached at 07410117478. Is there anything else I can help you with today? Sentence3: I'm sorry, I clearly wasn't paying attention. Yes that is all I need. Sentence4: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 0IJIWWQ9 . What else can I help you with? Sentence5: We have five hotels that meet that criteria, are you looking for a specific part of town? Sentence6: Yes. Have a great day. Sentence7: Anything in the centre would be fine, whatever you recommend. Sentence8: Regretfully, I don't have a listing for Venetian cuisine. Do you have a second choice? Sentence9: I'm looking for a place that has 3 stars and free parking. Sentence10: There are over a hundred restaurants to chose from do you have a price range? Sentence11: Does that one have free internet as well? If so it will work great for me. Sentence12: Yes I can. What type of place to stay would you like? What area of town? Sentence13: Yes the hamilton lodge is 3 stars moderately priced and offers free wifi and parking. Sentence14: There are 4 results. restaurant one seven, the oak bistro, the copper kettle, and cotto. Would you like more information on any of those? Sentence15: Sadly, I don't have access to that information. The Oak Bistro might be a good choice. Their phone number is 01223323361 if you'd like to call them Sentence16: Thanks, I need a taxi to commute between the two places. Sentence17: I am not looking for a specific area, but I would like for it to be in the moderate price range, please. Sentence18: Definitely something moderately priced. If you can't find Venetian, how about British? Sentence19: Thank you for calling. Sentence20: I'm looking for a restaurant that serves venetian food. Sentence21: Yes, please. Find out which of the four restaurants have vegan options, please? Sentence22: How about the hamilton lodge it's located in the north. Sentence23: I am traveling between the two places discussed, I need to reach the restaurant by the booked time. Sentence24: I can help you book a taxi but first I need some information - where are you leaving from and what's the destination. Also what time do you want to leave? Sentence25: I also need a place to stay. Can you help with that? Sentence26: Okay, well, let's go ahead and book a table for one at 11:30 on Tuesday. Question: Who has spoken the sentence 18? (A) User (B) System
Answer: (A) User

Sentence1: There are several in that price range. Did you have a particular area in mind? Sentence2: It should also be a guesthouse with a 4 star rating. Do you think Allenbell would work? Sentence3: No, but could I get their address? Sentence4: I do not. Can you make a suggestion? Sentence5: Yes, allenbell meets all that criteria. Would you like me to book? Sentence6: How many tickets do you need? Sentence7: Thank you. You as well! Sentence8: I have booked a ticket for one and here is the information-Booking was successful, the total fee is 17.89 GBP payable at the station . Reference number is : DFSN06MO . Sentence9: I also need a cheap place to stay with free parking. Sentence10: Yes, they are at 517a coldham lane, postal is cb13js, can I assist with anything else today? Sentence11: I only need one ticket. Sentence12: Great, that's all I need, thanks so much for your help! Have a great day! Sentence13: Yes, I would suggest allenbell Sentence14: I'm looking for train information that leaves broxbourne after 0800. Can you help? Sentence15: Yes, please! That would be great. Thank you! Sentence16: The TR3005 train leaves Broxbourne on Friday at 8:32 and will arrived at Cambridge at 9:32. Would you like me to book you? Question: Who has spoken the sentence 1? (A) User (B) System

Answer: (B) System