Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: Sure, where are you going to? Sentence2: Lets drop entertainment and look up one for the type of college. Sentence3: There are three trains that leave Cambridge after 21:00, would you like me to book one for you? Sentence4: Yes please book the train for me, and I will need the travel time as well. Thank you for your help. Sentence5: I'm going to leicester and need to leave after 21:00. Sentence6: No, that is ok. I appreciate all your help. Sentence7: Find a train that departs from cambridge, leaving on thursday, please. Sentence8: Christ's college, in the centre of town. Number is 01223334900. Address is post code, cb23bu, Saint Andrew's street. No fee to enter. Do you need anything else? Sentence9: I'm looking for a good place for entertainment in the centre. Any recommendations? Sentence10: Any one would be fine, can I just get the address, phone number and postcode? Sentence11: There are 13 colleges in the centre. Do you have one in mind? Sentence12: TR3470 leaves at 21:21 and arrives by 23:06, duration is 105 minutes. I will book it for you if you will tell me how many tickets you need. Sentence13: I hope you got all the information you need. Have a nice day. Good-Bye. Sentence14: Unfortunately there are no places in the centre. Would you like to try another area? Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System