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

Input: Consider Input: Sentence1: Booking was successful for the bridge guest house. Your Reference number is : LBEOV690 . Sentence2: Yes please. Which is the cheapest? Sentence3: Thank you. Have a nice day. Sentence4: No. I would like to make a reservation for Wednesday for 3 nights and 8 people. I will also require a reference number. Sentence5: I was unable to book your stay at any of the three hotels. Would you like to change the length of your stay or change the day? Sentence6: There are 2 hotels with a 3 star rating and free parking. Would you like to stay in the centre or south? Sentence7: Sorry, I was mistaken. There are 3 guesthouses matching your request. One each in the south, north, and west. Would you like to book one? Sentence8: Thank you. Have a nice day. Sentence9: Can you please try a 2 day stay. Sentence10: I can only tell you they are all in the moderate price range. Do you have any other preferences? Sentence11: I am looking for a hotel with a 3 star rating and free parking Sentence12: Either is fine. I'd like a guesthouse. Question: Who has spoken the sentence 5? (A) User (B) System

Output: Answer: (B) System

Input: Consider Input: Sentence1: I'm looking for an expensive restaurant in the center of town. Sentence2: Certainly. When would you like your taxi to depart? Sentence3: Is there any Turkish cuisine? If so I need the postcode and the address. Sentence4: No, that will be all, thank you! Sentence5: I need to arrive at Cambridge Contemporary Art by 19:15 please. Sentence6: Okay, have a nice day. Sentence7: I don't really care, what do you recommend? I will need the postcode and entrance fee please. Sentence8: I am also looking for museums in the area. Sentence9: How about Cambridge Contemporary Art? The entrance is free and the postcode is cb21su. Enjoy! Sentence10: There are many museums listed in the centre area, what kind of museum are you interested in? Sentence11: No problem. Your taxi has been reserved. Your driver's contact number is 07035811281 and will be driving a grey toyota. Is there anything else you need today? Sentence12: Thank you. I would also like a taxi to commute between the two places. Sentence13: There are many expensive restaurants in the centre of town, is there a specific type of food you would like? Sentence14: The Meze Bar restaurant matches your tastes. It is located at 196 Mill Road City Centre. The postcode is cb13nf. Question: Who has spoken the sentence 10? (A) User (B) System

Output: Answer: (A) User

Input: Consider Input: Sentence1: I'm sorry, I wasn't thinking clearly. I'm looking for a place in the West. I need free wifi as well, please. Sentence2: Sure. The phone number is 01223314960 and it's located at 98 King Street at CB11LN. Sentence3: I need to book 4 people for 5 nights starting friday please Sentence4: Your booking was successful with a reference number EGRKXU88 . Do you need anything else? Sentence5: No, that is all the help I will need today. Sentence6: There are four places to stay in the west that provide internet. What price range would you prefer? Sentence7: Yes, there are two when will you need the room? Sentence8: I'm sorry, but I wasn't able to book for 5 nights. Would you be able to stay a different day, or for a shorter stay? Sentence9: I don't mind cheap as long as it's still reasonably nice. Sentence10: I recommend Finches Bed & Breakfast. It's cheap, but still 4 stars. Would you like a reservation? Sentence11: Thank you so much for all your help! Sentence12: Okay can you provide me with their address, phone number and postcode please? Sentence13: It was a pleasure assisting you. Have a good evening. Sentence14: I assume you mean the center of town? We have many hotels in Cambridge covering all price ranges. Sentence15: You are very welcome. Can I help you with anything else? Sentence16: Does one of those two have free parking? If so, I'll book it for 4 people for 5 nights starting Friday. Sentence17: Can you try just one night? Sentence18: They both have free parking and internet. Would you prefer cheap or moderate priced? Sentence19: Yes, I'm also looking for a museum in the centre of town. Sentence20: How about the Broughton House Gallery? Sentence21: I don't care about the price range, but do you have one that is a guesthouse? Sentence22: I need a hotel close to downtown Cambridge please. Question: Who has spoken the sentence 16? (A) User (B) System
Output: Answer: (A) User