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

Sentence1: Yes I would like to book it for 4 nights for 1 person from Saturday. Sentence2: Those are all booked for the year due to events is a hotel okay? Sentence3: The Express by Holiday Inn Cambridge is the one in the east. Do you need any info on it? Sentence4: First we need to find you a attraction then we could book your taxi I think. Sentence5: No the area doesn't matter, and I know this sounds strange but I'm looking for a guesthouse with a 1 star rating. Sentence6: Could you possible check in the surrounding areas? I might as well also get a list of 2 star rated hotels. Do you mind? Sentence7: The south has cinema, entertainment, museum, nightclub, park and theatre. Which do you prefer? Sentence8: We have 23 Guesthouses that have free wifi, is there a particular area you want to stay in? Sentence9: Great, can I have the phone number and reference fee. Sentence10: I have 3 hotels that have a 2 star rating. Two are located in the north and one in the east, do you have a preference of area? Sentence11: Okay, I will work on booking this for you and be right back with you. Sentence12: I have made those reservations and your reference number is HF0MER2O . Sentence13: I would love a guesthouse but I do need wifi. Do you have any like that? Sentence14: Can you make a recommendation? Sentence15: Hi, I am planning a trip and need some help finding a place to stay. Sentence16: Okay, how about the one in the est please? Sentence17: I want to leave the hotel by 05:00. Going to the attraction. Sentence18: May i get the reference number? Sentence19: Just so I can get you the right information, are you interested in Byard art or tenpin? Sentence20: Great thanks I also need a taxi leaving the hotel by 05:00 Sentence21: I would recommend tenpin, which is an entertainment venue in the south. It's a lot of fun. Sentence22: somewhere in the south, sorry need the phone # and admission fee Sentence23: I hope you have a good trip. Have a nice day. Goodbye. Sentence24: Certainly, do you have any special requests or preferences? Sentence25: Unfortunately I don't have any information about their entrance fee but if you call them at 08715501010, they'll tell you. Will that be all today? Sentence26: Please send info on tenpin. Thanks for the help. Sentence27: OK, where are we taking the taxi to? Did we also need to book a restaurant or find an attraction? Sentence28: Thank you for the help. That's all for now. Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System