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

Sentence1: Thank you. That's all I need. Sentence2: I was able to book it, reference number is T2SNWPJA Sentence3: Okay, the Mahal of Cambridge serves indian food and is located in the centre. Would you like me to make a reservation for you? Sentence4: I am happy to help, what was the name of the place? Sentence5: Its the huntingdon marriot. I'd like to book it for 8 people on 2 nights starting on wednesday, and I'll need a reference number. Sentence6: Can you help me look up a particular hotel that I have in mind? Sentence7: Great, thanks for that. I'm also looking for information about a restaurant called mahal of cambridge. Sentence8: Yes please book a table on Wednesday for 8 people at 17:15, I'll need a reference number. Sentence9: It was my pleasure to help. Have a wonderful night. Take care. Bye. Sentence10: Your booking was successful reference number is 1QVLVD25 Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System

Sentence1: No thank you. You have helped tremendously. Sentence2: What is the address and postcode, please? Sentence3: Can you help me? I was in a car accident dispute. Sentence4: The Parkside Police Station's phone number is 01223358966 Sentence5: you are welcome Sentence6: The address is Parkside and the postcode is CB11JG. Can I help you with anything else? Question: Who has spoken the sentence 2? (A) User (B) System
Answer: (A) User

Sentence1: Could you give me a recommendation? Sentence2: Nope that's all thanks! Sentence3: Thank you for contacting us have a good day. Sentence4: How about 09:45 instead? Sentence5: I only need a booking for a party of 1. Sentence6: That sounds fine. Can you book me a table at 10:45 on Sunday? Sentence7: I have several options. What price range would you like? Sentence8: Sure, TR1873 is 60.08 GBP per ticket and is a 163 minute journey. Is there anything else I can do for you today? Sentence9: Ok, how many people will you be dining with? Sentence10: I am sorry that time is unavailable as well. Would you like to book for another day or time? Sentence11: How about The Ghandhi located at 72 Regent Street? Sentence12: i would like the 22:40 Sentence13: Sure, that is train TR1873. Would you like me to book some seats for you? Sentence14: Your booking was successful! Your reference number is 9F8YFU1O . Is there anything else I can help you with? Sentence15: No thanks. I will book later. But can I get the price and travel time please? Sentence16: How about 9:45? Sentence17: I am sorry that time is unavailable. Would you like to book for another day or time? Sentence18: There are three trains that meet this criteria, two from Birmingham New Street at 22:40 and 23:40, and one from London Liverpool Street at 23:39. Which do you prefer? Sentence19: Yes, I need to find a restaurant that serves indian food in the centre of town. Sentence20: I'm planning a trip to Cambridge and I'm looking for a train that leaves sunday and arrives at 5:30. Question: Who has spoken the sentence 4? (A) User (B) System

Answer: (A) User