Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: We have trains leaving before 8 every day this week, which day is preferred? Sentence2: i want to leave on monday and arrive by 8 Sentence3: I was also wanting to get some help finding a train to get me to London Kings Cross. Sentence4: Ok, the TR228 will get you to london at 07:51. It leaves cambridge at 07:00. Can I book it for you? Sentence5: Hey, when I was a kid my parents took me to a place called the cow pizza kitchen and bar. Is it still around? Sentence6: That was all I needed to know. Thank you, goodbye. Sentence7: Excellent, thank you for the assistance! Sentence8: You're welcome, have a great day. Sentence9: Your table has been booked. Your reference number is JGNHU2IV . The table will be reserved for 15 minutes. Sentence10: It certainly is. It's located at Corn Exchange Street. Sentence11: You're welcome, is there anything else I can help you with? Sentence12: The train is TR2289. The fare is 23.60 pounds. Do you need more information? Sentence13: Can you tell me the price? Sentence14: What day would you like your train to leave? Also what time, and where will you be departing from? Sentence15: I need to book a table for 5 at 16:45 on wednesday. Sentence16: I would like to leave on Monday. Question: Who has spoken the sentence 7? (A) User (B) System
A:
Answer: (B) System