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

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
Answer: (A) User

Sentence1: It does not matter, I just need one available for 7 people at 18:15 on thursday Sentence2: I'm sorry, nothing is coming up for that particular type of restaurant. Is there any other specifics you may like? Sentence3: The reference number is DVDLH9NK . Is there anything else I can help you with? Sentence4: Unfortunately I could not find any guesthouses meeting those requirements. Sentence5: How many stars is Cityroomz? Sentence6: Before I can book your taxi, what time are you wanting to leave or arrive by? Sentence7: Fantastic. Enjoy your trip! Sentence8: Not yet. I would like you to book a taxi for me between my hotel and restaurant. I will need the car type and contact number. Sentence9: It has a zero star rating, is this ok? Sentence10: I also need the reference number please. Sentence11: I just want to be sure it arrives by the booked time at the restaurant. Sentence12: Cityroomz is the only place that matches your criteria. Sentence13: That is fine. Do they have internet? Sentence14: I have made a reservation at restaurant alimentum for you. Your table will be reserved for 15 minutes. The address is 152 - 154 Hills Road. Sentence15: How about one that serves modern european food? Sentence16: Thank you very much for your help! That was everything I needed. Sentence17: How about a hotel type? Sentence18: There are 3 restaurants serving modern european food, would you prefer one on the south side or town centre? Sentence19: Yes, Cityroomz has internet. Would you like to book it? Sentence20: Booked. Your car type is white skoda and contact number is 07075801794 Sentence21: Can you find me restaurant with moderate prices that serves north indian cuisine? Sentence22: Yes, I also need a guesthouse hotel with moderate prices in the centre. I don't need free parking. Question: Who has spoken the sentence 15? (A) User (B) System
Answer: (B) System

Sentence1: Certainly! There are 3 options for moderately priced restaurants in the West: British, Indian or Italian. Do you have a preference? Sentence2: I'm wanting to find a restaurant. The location I want is the west and I want something in the moderate price range. Can you help me? Sentence3: Could I have the phone number for the Indian restaurant? Sentence4: You're welcome! Have a great day! Goodbye. Sentence5: Yes, the phone number for the meghna restaurant is 01223727410. What other information would you like? Sentence6: That's all that I needed, thank you. Question: Who has spoken the sentence 5? (A) User (B) System

Answer: (B) System