Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: i am looking for a train. The train should leave on Saturday and should depart from Cambridge. Sentence2: I can help with that! Where will you be traveling to? Sentence3: Okay, great. Call us back if you need anything else. Goodbye. Sentence4: I want to arrive by 19:30 please Sentence5: Train TR9495 arrives at 19:08. Would you like to purchase tickets? Sentence6: Okay, I changed the day of travel to tuesday for you. Do you know what time you might want to leave after or arrive by? Sentence7: No thanks, that's actually all the info I needed from you today. Thank you! Sentence8: Make that Tuesday. And I need to go to Stansted Airport. Question: Who has spoken the sentence 7? (A) User (B) System
A:
Answer: (B) System