You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Sure, I've got lots of options for you. What day would you like to travel on? Sentence2: I'd like to leave on Sunday after 12:00. Can I have the arrival time, price, and train ID please? Sentence3: sure, where do you want to depart and arrive? Sentence4: Yes it is in the city's center. Sentence5: it will cost you 8.08 pounds Sentence6: TR5358 leaves Stansted Airport at 12:24 on Sunday and arrives in Cambridge at 12:52. Would you like me to book it for you? Sentence7: I want to get take the bus to the centre area then take a taxi tour of the area can you help me arrange that. Sentence8: Welcome, it was a pleasure serving you. Sentence9: I don't want to book right now, but could you confirm what area of town that is in? Sentence10: I would prefer a hotel. Sentence11: Thanks! No need, I just need the price, please. Sentence12: Thank you. That is all for now. Sentence13: Any arrival time is fine as long as I leave Stansted Airport after 12:00. The train which leaves the soonest after 12:00 would be fine with me. Sentence14: Of course! Cityroomz's postcode is cb12tz, you can reach them by phone at 01223304050. How many nights would you like to book? Sentence15: I've changed my mine. I'd like a train that departs from stansted airport and goes to cambridge instead. Sentence16: Can you help me find a place to stay that has 0 stars and doesn't need to have free parking? Sentence17: There are 2 results in the centre and one in the north. Would you like more information on one? Sentence18: 0 stars, what could go wrong. I just need to find out the postcode and phone number. Sentence19: Cityroomz is a hotel that has a rating of 0 stars. Would like to book a room? Sentence20: There are several trains that leave after 12:00. Do you have an arrival time in mind? Question: Who has spoken the sentence 2? (A) User (B) System
Output:
Answer: (A) User