You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: No preference, either will do. Sentence2: Yes I need it for 5 nights from Tuesday for 6 people. Sentence3: No thank you. That will be all. Sentence4: ashley hotel in Northe part of town Sentence5: Okay thank you for calling. Enjoy your stay. Sentence6: Yes I have two options in the north and on in the east, any preference? Sentence7: I need a two star room, free parking included. Sentence8: I was able to book you at express by holiday inn cambridge, your reference number is MSGBHKWK, is there anything else that I can assist with? Sentence9: I'm sorry but that booking did not go through. Shall I try another hotel for you? Sentence10: Yes one in the same price range. Sentence11: I will. Have a nice day. Sentence12: So happy I was able to help. Good-Bye. Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User