Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: Yes, please choose the one closest to my arrival time. Sentence2: I'm looking for a train. The train should arrive by 21:30 and should go to bishops stortford. Sentence3: I actually only want the price, but can you make sure that the train is leaving from Cambridge. Sentence4: Yes that leaves from Cambridge and there are many other times with an earlier departure time if you'd like. The price is 10.10 pounds. Sentence5: What day will you be traveling? Sentence6: I would like to travel on Monday. Sentence7: Thank you, goodbye! Sentence8: That is perfect thank you very much for all of your help. You have a wonderful day. Sentence9: I recommend the TR8244 which leaves at 19:29. How many seats do you want me to reserve for you and your party? Sentence10: There are 8 trains that match your search. Shall I choose one to book? Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User