Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: What time would you like to arrive by? Sentence2: That is located in the centre. The address is bateman street. Can I give you any other information? Sentence3: You're welcome, have a great day! Sentence4: The TR4494 meets your criteria. Would you like to book tickets? Sentence5: I don't need to arrive at a specific time, as long as the train leaves after 9:30. Sentence6: Booking was successful, the total fee is 99.6 GBP payable at the station . Reference number is : PAR7KYOS . Sentence7: I need a train that leaves on Tuesday after 9:30 and arrives in London Liverpool street. Sentence8: I am looking for an attraction called cambridge university botanic gardens. Sentence9: Okay the post code is cb21jf and phone number is 01223336265. Sentence10: Great can I get 6 tickets for that? Sentence11: Can I have their postcode and phone please? Also I need a train out of cambridge on tuesday. Sentence12: I am planning a trip in Cambridge Sentence13: Great! Can I help you with transportation, lodging or attractions while here? Sentence14: Great, thanks, that's everything I need. Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System