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

Example Input: Sentence1: Yes, what type of attraction is Cherry Hinton Water Play? Sentence2: Please book it and send me the confirmation code. Sentence3: Again thank you and have a great day. Sentence4: Thanks I'm also looking for a train that leaves on Thursday. Sentence5: Just one seat. Sentence6: OK, what are your departure and arrival stations, and what time do you want to travel? Sentence7: Before i book it, could you confirm the number of seats you need? Sentence8: You're welcome! Is there anything else I can help you with? Sentence9: It is a park. Sentence10: Excellent, I can't wait to visit it! Thank you. Sentence11: I am looking for information about the the Cherry Hinton Water Play Sentence12: excellent, have a great day! Sentence13: I'd like to go to Cambridge via Broxbourne. I'd like to leave on Thursday and arrive no later than 12:00. Sentence14: That is a free park on the east side of town. They are located at Cherry Hinton Hall on Cherry Hinton Road. Their phone number is 01223446100. Sentence15: I have on that arrives at 11:32. Would you like me to book that for you? Sentence16: Perfect thanks for the help thats everything I need! Sentence17: Well I glad i can help enjoy your stay ! Sentence18: Your booking was successful! The reference number is 698RE4W1 . The total fee of 17.89 is payable at the station. Question: Who has spoken the sentence 17? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Thanks! I'm all set now. Bye! Sentence2: i am looking for a place to stay. The hotel should have a star of 4 and should include free wifi. Sentence3: I have several, when is your stay? Sentence4: A white bmw is booked for you. The contact number is 07793421858 Sentence5: There are 21 options. What type of food do you like? Our restaurants are quite diverse. Sentence6: a and b guest house is very nice Sentence7: Okay, now I would like to find a restaurant in the centre that is also in the moderate price range Sentence8: Yes it is in the moderate price range, what help can I help with? Sentence9: Ah, it was just a temporary lapse, it is back up now. I have you booked. The reference number is K9PYGG5A . Sentence10: Booking was successful. Reference number is : ZCRPOLK8 . anything else? Sentence11: Yes! What do you mean it's down? I need a place to eat! Sentence12: Choose one and surprise me. And book it for 6 people on thursday at 13:15. I'll need the reference number Sentence13: I'll need it to pick me up from the hotel and arrive at the restaurant at least 10 min before our reservation? Sentence14: You are welcome and good bye Sentence15: What is the name of the restaurant you booked the reservation at? We will also need a taxi to get there from the guesthouse. Sentence16: It was restaurant one seven, what time would you like that taxi? Sentence17: Can you confirm a and b guest house is in the moderate price range, please? Sentence18: It appears our booking system is down. Is there anything else I can do for you? Sentence19: book for 6 people and three nights starting on thursday. Sentence20: Do you have one that is a guesthouse? Question: Who has spoken the sentence 4? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: Thank you so very much. I am done. Sentence2: You're welcome. Have a good time! Sentence3: You are booked for a blue bmw with the contact number 07889414601. Sentence4: I need to book a taxi to take me to Williams Art and Antiques. I need to leave after 24:30. Sentence5: I'll be leaving from vue cinema. Sentence6: No problem - where should I have them pick you up? Question: Who has spoken the sentence 4? (A) User (B) System
Example Output:
Answer: (A) User