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: Hi, could you help me find a restaurant called ask. Sentence2: Ask is a cheap Italian restaurant located at 12 Bridge Street City Centre, and their phone number is 01223364917 Sentence3: I can book at zizzi bambridge at 16:45 on Tuesday for 8 people. Sentence4: That will work. Sentence5: That's all thank you for your help today! Sentence6: Are you able to set up a reservation for 8 people at 16:45 on Tuesday? Sentence7: Please try booking a different restaurant in the same area and price range. Sentence8: Reference number is : WK5JKOHN . Need anything else? Sentence9: Unfortunately, the booking was unsuccessful. Would you like to look for another restaurant? Sentence10: You're welcome! Have a great day! Question: Who has spoken the sentence 9? (A) User (B) System
Answer: (B) System