Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: thank you for using this service good bye Sentence2: Free is great for entrance fee. I'll just need the postcode. Sentence3: I need to go Cambridge from London Liverpool street on Thurday, please. Sentence4: Sure. There are 7 options. Do you have any preference as far as entrance fee? Sentence5: Okay! How about the 13:59 train? It's the earliest one after 12:30. Sentence6: there is a train leaving for london kings cross at 13:00, would you like me to book a seat for you? Sentence7: No, thank you - were you just going to book a random day for me? Sentence8: Where are you traveling from and your destination? Also what day? Sentence9: Cafe Jello gallery is free. Their postcode is cb30af. Sentence10: No thank you. You've been very helpful. Have a great day! Sentence11: I'm also looking for a train to leave after 12:30 Sentence12: What about a museum on the west side? Sentence13: I booked you 6 tickets on the TR4187. Your reservation is OQ5TX031 . A total of 99.6 GBP is due at the station. Is there anything else I can help you with? Sentence14: THat sounds great, can I please get 6 tickets? Sentence15: I would like to find out about going to a park in the west. Sentence16: There are no parks in the west. Would you like me to look in another area, or for a different attraction? Question: Who has spoken the sentence 2? (A) User (B) System
Answer: (A) User