Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: I would be open to a guesthouse if there are no 3 star hotels. I would like to stay in the moderate price range if possible. Sentence2: I can look that up for you. First, can you tell me the day and time frame you were thinking of travelling? Sentence3: Nope, that was everything, thank you very much! Sentence4: No thanks. Not today. But I could use some help finding a train from Leicester to Cambridge. Sentence5: I'm sorry, but I found no hotels matching your criteria, would you like to look for a cheaper hotel? Sentence6: It needs to leave after 17:45, thanks for checking. Sentence7: Yes, I would like a hotel in the moderate price range with 3 stars. Sentence8: I have bridge guest house. Would you like me to make a reservation,? Sentence9: There are 4 moderately priced guesthouses available. Is there a particular area you would like to stay in? Sentence10: Sure. I'd recommend TR9629 which leaves at 18:09 and arrives at 19:54. The price is 37,80 pounds per ticket. Sentence11: I would like to stay in the south area if possible. Sentence12: Pick one for me and give me the price and arrival time if you don't mind. Sentence13: Just to check, does TR9629 leave on Friday? That's the day I would like to travel. Sentence14: You're welcome. Don't hesitate to ask if there's ever anything else we can help you with. Sentence15: I am looking for a moderately priced 3 star hotel to stay in in Cambridge. Sentence16: There are 42 trains that leave after 17:45. Sentence17: Yes, TR9629 leaves on Friday. Can I help you with anything else? Sentence18: Unfortunately, i have no matches for your request. Would you like for me to search all hotels in cambridge. Question: Who has spoken the sentence 11? (A) User (B) System
A:
Answer: (B) System