You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Example: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Example solution: Answer: (A) User
Example explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

Problem: Sentence1: What day will you be traveling on and what is your departure city? Sentence2: I'm looking for a hotel in the north to stay in. Can you help me? Sentence3: I do need a train from london liverpool street on tuesday please. Sentence4: Okay. Thank you for all your help. Sentence5: All booked. Your reference number is TPJE3LTQ . Is there anything else I can help you with? Sentence6: Yes please book one for 6 people and 4 nights starting from tuesday. Can I please have the reference number? Thank you for your help. Sentence7: I will book that for you now. Sentence8: Are you sure you want to book now, if so, how many people? Sentence9: The booking was successful. Reference number is MO0RU0NN . What else can I help you with? Sentence10: We have 2 hotels in the north. Both are in the moderate price range. Sentence11: Your welcome, have a good day. Sentence12: Yes, they both do. Do you want to book one? Sentence13: There are 5 leaving after 15:15. The first one is leaving at 15:39 and takes 88 minutes. You'd arrive by 17:07 and the cost is 16.60 pounds. Sentence14: Please book for 6 people. Sentence15: Your booking was successful. Can I help you with anything else like restaurants or attractions in the area? Sentence16: I need to depart from london liverpool street, after 15:15. Can you tell me how long the travel time is too? Sentence17: I'd like to book the previously mentioned train that leaves 15:39. Sentence18: The train ride time is 88 minutes. Would you like me to book that for you? Sentence19: Can I look up anything else for you? Sentence20: No thanks, group is still deciding on a carpool or a train, but thank you for all of the help. Sentence21: Great! Do either one have a 2 star rating? Sentence22: It needs to be on Tuesday. Sentence23: on which day do you want to travel? Sentence24: I need a train to Cambridge. Question: Who has spoken the sentence 4? (A) User (B) System
Solution: Answer: (A) User