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: i also want a taxi to commute between the two places Sentence2: That's it for now. Thank you for you patient help. Goodbye. Sentence3: book a hotel for 7 people and 2 nights starting from wednesday Sentence4: I have 24 options available. Do you have a specific area in mind? Sentence5: It will be picking me up from the hotel. I'll need the contact number and car type, please? Sentence6: First let's pick one of the 14 guesthouses and then I'll book your room! Sentence7: Absolutely! Your Booking was successful. Reference number is : 7ZCFV2O4 . Is there anything else you need? Sentence8: I need a guesthouse to stay while I'm in town. I don't care if it has free parking or not. Do you have something I could get? Sentence9: We have five parks available. Do you have an area that you would prefer? Sentence10: Yes, I would recommend acorn guest house. Sentence11: I should be able to help you with that. Are you traveling to the Botanic Gardens or from? And what time do you want the taxi for? Sentence12: I'd like someplace in the center, please. Sentence13: There are 14 guest house with internet and moderate price what area would you like Sentence14: Sounds good. There are a lot to chose from, is there one that you specifically recommend? Sentence15: And where would you like the taxi to pick you up? Sentence16: That sounds fine can you book for seven people for two nights starting Wednesday? I'm also looking for a park to visit. Sentence17: You are booked for a white audi with the contact number 07387814664. May I help with anything else, like a restaurant? Sentence18: Yeah, any time I was happy to help. Sentence19: I'm also looking for a park to go to while I'm in town. Sentence20: i want to leave the hotel by 01:15 Sentence21: The Cambridge University Botanic Gardens is located in the centre. It's on Bateman Street. The entrance fee is 4 pounds. Can I help you with something else? Sentence22: No specific area but i do need wifi and a moderate priced guesthouse please. Question: Who has spoken the sentence 4? (A) User (B) System

Output: Answer: (A) User

Input: Consider Input: Sentence1: In the centre yes please. Sentence2: Can you give me the contact number for that taxi you booked? Sentence3: No, thank you. That all sounds good. Sentence4: I need info on the Cambridge and County Folk Museum please. Sentence5: At what time would you like to leave the museum? Sentence6: Anything else I can do for you? Sentence7: What type of car have you booked? Sentence8: I'm also looking to book a taxi between the two locations. Sentence9: Ok, it's called Ali Baba. How many people will be in your party? Also, what day and time would you like? Sentence10: Okay, your table is booked. The reference number is 7GD7F8A8 . Anything else I can do for you? Sentence11: Yes, I will have one pick you up Sentence12: A grey lexus will be picking you up. Can I assist you with anything else? Sentence13: I am sorry but there is not a lebanese restaurant in the west area, but I found one in the centre. Would you like me to book a reservation? Sentence14: Okay do not hesitate to call us if you need something else. Sentence15: No thank you. But thank you for all your help. Sentence16: The museum is located in the west side of town at 2-3 Castle Street. The entrance fee is 3.50 pounds. Their phone number is 01223355159. Shall I connect you? Sentence17: Your booking is completed. You will be picked up by a grey lexux. Can I help you with anything else today? Sentence18: could i get a taxi as well? Sentence19: Absolutely, the contact number for the taxi that I have booked for you is 07503689471. Is there anything else I may assist you with? Sentence20: I would like to make a reservation for 2 people at 19:30 on Tuesday. Sentence21: I just want to make sure I am at the restaurant by 19:30. Sentence22: Yes, I am also looking for a nice, moderately priced Lebanese restaurant in the area. I'd prefer it to be within walking distance of the museum. Question: Who has spoken the sentence 18? (A) User (B) System

Output: Answer: (A) User

Input: Consider Input: Sentence1: Okay, you're all set! I have it booked for Sunday, 18:00, and for 2 people. Your reference number is LR4G3953 . Is there anything else I can help with? Sentence2: What does Cambridge offer so far as expensive, German restaurants? Sentence3: You are welcome. Are you certain I can't help with a hotel or a train for you? Sentence4: Thank you for calling and have a great trip to Cambridge. Goodbye. Sentence5: That is all I needed. Thank you! Sentence6: Yes, actually, I'm looking for a train. I'll need to depart from Cambridge after 20:00. Sentence7: I'm terrible at math. What time does that arrive? Sentence8: i want to travel on sunday. i need to leave cambridge at 20:00. Sentence9: Is there any asian oriental restaurants in the north area? Sentence10: There's no restaurants meeting your criteria. Would you like to change anything parameters? Sentence11: Would you like to search for something else? Sentence12: I am going to Ely on Sunday. Sentence13: TR0537 leaves at 21:50 and arrives in 17 minutes. Do you want tickets for that? Sentence14: Yes, there is one called Saigon City. Would you like more information? Sentence15: Thank you for all your help. Have a great day. Sentence16: We have lots of those! Where are you traveling to? Sentence17: The arrival time is 22:07. Sentence18: I would like you to book it. 2 people 18:00 on Sunday. Sentence19: Oh really? I was hoping to eat expensive German cuisine in the northern part of town. Sentence20: What day will you be taking the train? Question: Who has spoken the sentence 4? (A) User (B) System
Output: Answer: (A) User