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: How about Mexican food? Sentence2: Okay! There are 5. Would you like Chinese, Indian, Italian, or Mexican cuisine? Sentence3: Yes, please. Can you reserve me a table for Tuesday for 8 people at 15:15? Sentence4: You're very welcome. Enjoy your meal! Sentence5: I would like to try some Japanese, do you have anything matching that? Sentence6: Unfortunately, no. Would you like to change the location or the restaurant type? Sentence7: No that was all I needed. Thanks so much for the help. Sentence8: The Chiquito Restaurant Bar fits your criteria. Would you like to make a reservation? Sentence9: Your table is reserved, reference #UCRWM8U3 . Can I help you with anything else today? Sentence10: Hi, I am looking for an expensive restaurant in the south. Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System