You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: sure, what kind of information are you looking for? Sentence2: I have two hotels located in the west. One is cheap and one is expensive. One hotel is located in the centre and is expensive. Any preference? Sentence3: That is all I need, thank you. Good bye. Sentence4: Yes, could you give me information on the cambridge corn exchange? Sentence5: I don't have a preference. But it does need to have 4 stars and include free parking. Sentence6: Can you tell me the area the cheap one is in and give me it's phone number? Sentence7: I wanted help with finding a hotel in Cambridge today. Sentence8: The cheap hotel is in the west. The phone number is 01954714600. Can I help you with something else? Sentence9: Sure, are you looking to stay on a certain part of town? Sentence10: I need the postcode please. Sentence11: here you go cb236bw Sentence12: Have a great day, please let us know if you need any further assistance. Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User