You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Would you like to stick with Asian Cuisine? Sentence2: Any kind of entertainment in the Centre please. Sentence3: Great. Can you please give me the address? Sentence4: I'm sorry but I can not book that. Sentence5: Can you please just book me for taxi service? Sentence6: Hmm, how about 11:00? Sentence7: I am sorry I cannot book it at that time. Would you like to try another restaurant? Sentence8: Alright. How many people is this for? Sentence9: Sure, what do you have available? Sentence10: Great, can you also book a taxi for me? Sentence11: Absolutely! The address is 2 norfolk street. Sentence12: You are welcome. Thank you for your patience. I'm sure you will have a delightful visit to Cambridge. Goodbye. Sentence13: Yes, the type of concert hall. I need address and a taxi for 11 and the car type and contact number please Sentence14: What kind of attraction would you like to see? Sentence15: I just need it to arrive at the restaurant at the correct time. Sentence16: Sorry, the restaurant can't accommodate you during that time. Sentence17: I do need the departure place and destination in order to book the taxi. Sentence18: It will be for six people. Sentence19: Can you book it for 11 instead? Sentence20: Would you like a reference number. Sentence21: I'm looking for a restaurant called Thanh Binh. Can you help me find it? Sentence22: I'm sorry. I'm not sure what is going on. It will not let me book. Would you like to try a different restaurant? Sentence23: I have booked you with a blue honda to arrive by 12:00 at the restaurant. The phone number to contact them is 0713064642. . Sentence24: Yes but if you could book it for 6, at 12:00 on friday, that would be good. Sentence25: Yes, please. I need it to get to the restaurant in time for that reservation. Sentence26: From the concert hall to the restaurant. Sentence27: No thank you. Can you help me find an attraction? Sentence28: Nothing was found. Shall I look for entertainment in a different area? Sentence29: You are in luck, I have managed to get you a table for 6 at 12:00 Friday at Thanh binh. 9N8M4HQ9 is the reference. Would you still like a taxi? Sentence30: Where are you departing from and where are you headed? Sentence31: Sounds perfect. Could you book it for myself and five others on Friday? Sentence32: Absolutely! Thanh Binh is a wonderful vietnamese restaurant in the west. It is relatively cheap. Would you like any more information about them? Sentence33: Thank you, that is everything. Sentence34: I can, would you like the reference number? Sentence35: Can you please try again at 12 on friday? Sentence36: How about 11:00 that day? Sentence37: Looks like my system is acting up and can't accept you for 11:00. Want to try for another time? Sentence38: Yes, please try for 12:00 Sentence39: I'm sorry I am unable to book that. Sentence40: There is one concert hall in centre. It is called the man on the moon. Sentence41: I need to book a reservation for you to tell the taxi man... Sentence42: Of course I would like the reference number. Question: Who has spoken the sentence 11? (A) User (B) System
Output:
Answer: (B) System