Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Sounds good. Please make a reservation for 3 next Wednesday at 14:15. I would like a reference number. Sentence2: Since I like Chinese food, could you see if any restaurants serve both Thai and Chinese food? Sentence3: Lets go with chinese food. He likes chinese just as much. Can you recommend one in the centre? Sentence4: Could you recommend an expensive restaurant in the city centre? Sentence5: I cant get you a table there. How about tang chinese instead. Your reference number is SAG9PAI9 . They have better food. Sentence6: I apologize I do not have any listed that serve both cuisines. Would you prefer one type of food? Sentence7: You're welcome! Have a great day! Sentence8: I can book a table at bangkok city for 2 when would you like the reservation? Sentence9: It's for my friend's birthday and he really likes Thai food. Sentence10: That is fine. Thank you. Sentence11: I show several restaurants in the City Centre. If you could perhaps indicate what type of food you would like it would narrow my search further. Sentence12: I have the ugly duckling in the centre. Would you like to make a reservation there? Question: Who has spoken the sentence 6? (A) User (B) System

Answer: (A) User