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: sure its 01223364222 Sentence2: Is there anything more I can help you with? Sentence3: I'm sorry, there are no hotels that meet your criteria. Would you like to try searching for something else? Sentence4: Unfortunately this guest house doesn't offer parking, would you like me to search for similar hotels that offer parking? Sentence5: Have a good day! Sentence6: the a and b guest house is a great place Sentence7: That is all I need. Goodbye. Sentence8: Ok. Thanks. All set. Sentence9: Yes. May I have the phone number? Sentence10: Sorry for the confusion, I have that booked for you, your reference # is: HQSOZLWH . Can I help you with anything else today? Sentence11: how about one that is in the type of nightclub. Sentence12: There's the club ballare which is rather nice. Would you like some more information about it? Sentence13: i need a place to stay in Cambridge thats 4 star with free wifi Sentence14: There are seriously no 4 star hotels with free wifi and free parking in all of Cambridge? I'm pretty sure there should be. Sentence15: Great! Could you book it for 5 people and 3 nights starting from wednesday? Sentence16: Do this hotel offer free parking also? Sentence17: Yes I do. When you find it, I need 3 nights for 5 people starting on Wednesday. I'll take the reference number too. Sentence18: The arbury lodge guesthouse is 4 stars, it has internet it is in the moderate price range Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User