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: Can you book it for me? Sentence2: say hi to your family. Sentence3: I am staying in west cambridge. Are there any parks out there to take my kids to? Sentence4: There are 7 different museums in the west area. All are free addmission except one. Would you like me to make a suggestion? Sentence5: The ticket price is 8.08 pounds. The departure time is 05:24. May I help you with something else? Sentence6: Yes, please pick one for me, and let me know the entrance fee, phone number and postcode. Sentence7: I will thank you. Goodbye. Sentence8: There are 7 different parks on the west side. I would recommend a free park called Kettle's Yard. Would you like more information on it or any other park? Sentence9: how about TR4194? it arrives at 05:52 Sentence10: I would recommend People's Portraits Exhibition at Girton College. They offer free entrance. Their postcode is cb3ojg. Their phone number is 01223338901. Sentence11: thank you and have a great day Sentence12: No that is all the information I need today. Sentence13: How about a train? I need to go from Stansted Airport to Cambridge on Saturday and arrive there by 08:45. I need departure time, train ID, and price. Thanks! Sentence14: That is all. Have a great day. Sentence15: There are no parks on the west side of town. Do you want me to search for a park in a different part of town? Sentence16: I'm sorry, we don't do bookings for attractions. Sentence17: No, can you look for a museum instead? Sentence18: Are there any museums on the west side of town? I will need the entrance fee, phone number, and postcode. Sentence19: Your welcome. Have a great day. Sentence20: Sounds great. I don't need to book it, but I would like the price. Question: Who has spoken the sentence 9? (A) User (B) System
Answer: (B) System