Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I do not have anything that meets that criteria. Sentence2: Any are would be fine. Can you just check if you have anything that's 5 star rated? Sentence3: There are many, would you be departing on Sunday? Sentence4: I can help with that. What area would you like to stay in? Sentence5: I recommend El Shaddai. Can I get you information on it? Sentence6: I have two with a 0 star rating, one in the north and one in the centre. Do you have a preference? Sentence7: Is there anything else I can assist you with today? Sentence8: You are booked with reference number 9N3UAJNA . Anything else I can help with? Sentence9: Okay. Thank you for al your help. Sentence10: I would need an area to narrow the search for you. Sentence11: I don't care. I want a 5 star rating though. Sentence12: No, it doesn't matter. Thank you. Sentence13: Your tickets have been booked. Your reference number is 7LBIW6SB . Sentence14: Please help me find a guesthouse to stay in that has free wifi. Sentence15: I am all set. Sentence16: You'll be leaving Cambridge at 11:59 on Friday, for a travel time of 88 minutes. Sentence17: book it for 4 people and 5 nights starting from sunday. Sentence18: How about one that is a 0 star? Sentence19: Have a nice day. Sentence20: Thank you and please inform of the travel time and departure time. Sentence21: 4 people leaving Cambridge and going to London Liverpool Street on Friday, departing after 11:00. Please give me the travel and arrival time as well as the price. Sentence22: Thanks. I also need a train departing from Cambridge after 11:00. Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System