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

Sentence1: Price range doesn't really matter, but I do want a 4-star place with free parking and internet. Sentence2: I have 19 hotels that match that criteria. please be more specific about the area of town where you'd like to stay Sentence3: Do you prefer a formal hotel, or a guesthouse? Sentence4: OK, what price point do you want me to look for? Sentence5: Booking was successful at the alexander bed and breakfast. Reference number is : MDB2AV4K Sentence6: i need a place to stay Sentence7: The area doesn't matter. Please book for 6 people on Saturday with 4 nights stay. Sentence8: Can you give me a suggestion for a hotel and make that reservation please? Thanks. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User

Sentence1: There is a restaurant called Thanh Binh. Would you like me to book a table? Sentence2: Yes i would like a table for 7 people on monday at 13:15 Sentence3: We would prefer vietnamese please. In the west area? Sentence4: How many tickets would you like me to book? Sentence5: The travel time is 49 minutes. Would you like to know any more info? Sentence6: Thank you, what is the arrival time? Sentence7: Your reservation has been set for Monday at 12:15 for 7 people. The reference number is 3MTLQCBA . Can I do anything else for you? Sentence8: I am leaving from Cambridge and headed to Stevenage. I would like to leave after 17:30 please. Sentence9: Just one ticket, please. Sentence10: Certainly. The train will arrive at 20:10. Can I help you with anything else? Sentence11: Can you tell me when that train will be arriving in stevenage? Sentence12: Alright, TR6692 looks like your best bet. Would you like me to book you passage? Sentence13: Thank you I also need a train on tuesday leaving after 17:30 Sentence14: I think that about does it. Thanks for the help today. Sentence15: I need to find a cheap place to eat. Sentence16: Booking was unsuccessful do you have any other preference? Sentence17: Can you try 12:15 on Monday? Sentence18: I've booked that ticket for you. The reference number is FTLHURXQ, and the total fee is 12.8 GBP. Sentence19: It was my pleasure to assist you. Thanks for using our service. Have a wonderful day. Goodbye. Sentence20: Yes. Please book that for me. Thanks so much! Sentence21: I can find that for you. What cuisine are you interested in? Sentence22: I would be happy to help with that. Can you tell me the departure city and where you are going? Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System

Sentence1: Yes, book it for 7 people at 17:40 Sentence2: Ok there are 7 choices. Is there a particular time you'd like to arrive at your destination? Sentence3: not really, it just needs to leave after 17:15. Sentence4: There are plenty of choices starting at 17:40 and leaving every hour onwards. Do you want me to book it? Sentence5: Booking was made, ref number is 6QWLFWW5! Do you need anything more? Sentence6: I'm looking for a train on Sunday that leaves after 17:15. Sentence7: I'll be leaving from cambridge and heading to stansted airport. Sentence8: thats all, see ya! Sentence9: What are your departure and arrival destinations? Sentence10: have a safe trip, bye. Question: Who has spoken the sentence 9? (A) User (B) System

Answer: (B) System