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: Booking was successful, the total fee is 17.6 GBP payable at the station. Reference number is : UK9225HY . Is there anything else I can do for you today? Sentence2: Can you help me find a train leaving Tuesday from Norwich? Thanks. Sentence3: I would like to making a booking for one please. Sentence4: I have about 19 different trains. Do you have a certain time you would like to leave after or arrive by? Sentence5: I want to leave after 20:15. Sentence6: At 20:16 a train leaves for Cambridge duration of which is 79 minutes. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System