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

Sentence1: how about something in the moderate price range? Sentence2: Well I'm really looking for that expensive guesthouse type. How about something in the north with free parking included? Sentence3: Sure, please make a reservation for 2 people 2 nights starting on thursday. Sentence4: Can we make it 1 night then? Sentence5: Thank you for using our service. Sentence6: There are no results for expensive guesthouse in the north. Would you like to try something else? Sentence7: Thank you for assisting me with that. I won't need anything else today. Sentence8: Sorry, the hotel can't accommodate you for that time frame. want to change dates? Sentence9: How about acorn house? I hear it's lovely. Sentence10: I'm sorry there are no results for an expensive guesthouse, would you like to try another type, such as hotel? Sentence11: I am looking for a place to stay. The hotel should be in the expensive price range and should be in the type of guesthouse Sentence12: Booking was successful for one night. Reference number is : FJFV11JA . Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System