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

[EX Q]: Sentence1: No thank you. Can I have to phone number and postcode for that restaurant? Sentence2: I need a train to Kings Lynn. Sentence3: Thank you for using our service. Sentence4: The earliest train leaving after 17:00 on Friday leaves at 17:11. Would you like me to book this train for you? Sentence5: That would be TR9226 Sentence6: The phone number is 01223247877. It's located in the cb13nl postcode. Sentence7: Hmmm....how about an expensive restaurant serving gastropub food in the east? Sentence8: Thank you, goodbye. Sentence9: I am looking for a restaurant in the east that serves international food. Sentence10: No. There are two moderately priced restaurants with international cuisine in the centre of town. Would you like to hear about those? Sentence11: Book it, please. I need a single ticket. Sentence12: The the missing sock fits that criteria and is in the cheap price range. How else can I assist you? Sentence13: What day would you be wanting to travel? Sentence14: There's one restaurant that fits your requests, would you like me to book a reservation? Sentence15: Thanks again for the information! Sentence16: Have a great time. Sentence17: Have a great day as well. I think you'll love the Royal Standard. Sentence18: Thank you so much. Have a nice day! Sentence19: Friday please. From Cambridge leaving after 17:00 Sentence20: Can you give me the train ID on that one please? Sentence21: Is there one in the expensive? Sentence22: You have been booked for the train. Your reference number is 0UIC4MX9 . Can I help you with anything else? Question: Who has spoken the sentence 20? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I don't have anything matching your request, would you like to change your hotel location or star rating? Sentence2: Hi. Could you help me with finding a hotel? Sentence3: No, thanks. That's all. Have a blessed day. Goodbye. Sentence4: Okay that was comleted successfully and your reference number is E5BQH7U1 . Sentence5: How about a 4 star hotel with free parking? Sentence6: I need a hotel for 4 people and 4 nights starting from thursday Sentence7: Great thanks. I need a taxi from Gonville Hotell to Cherry Hinton Hall and Grounds at 13:15. Sentence8: There are actually no lodgings of any kind in the east part of town listed. Would you like to try another area. The centre is very popular? Sentence9: Your taxi was booked successfully. You will be picked up in a black Tesla by 13:15 at the Gonville Hotel and dropped off at Cherry Hinton Hall and Grounds. Sentence10: This is really frustrating. Can you find me any 3 or 4 star hotels anywhere ? Sentence11: Great. Do you have a contact number? Sentence12: I'm still not finding anything. Would you like a different area? Sentence13: Thank you for using the Cambridge TownInfo centre. Goodbye. Sentence14: Absolutely! It is an entertainment attraction in the east. Phone is 01223446104. Postcode is cb18dw. And address is cherry hinton road. There is no entrance fee information listed. Sentence15: book for 4 people 4 nights from thursday Sentence16: Absolutely, do you have any other requirements? Sentence17: Could you double check for a 3 or 4 star hotel on the east side with free parking? Sentence18: Oh wow. I really need to find something. Would you mind looking again? 4 Star rated in the east with free parking. I would really appreciate it. Sentence19: Sorry. There are no matches. Is there anything else I can do for you today? Sentence20: That was a mistake. There are lots of 4 star hotels here. What is your price range? Sentence21: I am sorry but there are no 4 star hotels in the east in the expensive range. Would you like to try another price range, area, or star rating? Sentence22: Leverton House is a 4 star guesthouse in the east part of town in the cheap price range with both internet and parking included. Is there anything else today? Sentence23: Let's go expensive. I need to book it for 4 people for 4 nights on Thursday. Sentence24: I'm sorry but I have a hard time believing there is no place to stay in the east with either a 3 or 4 star rating. Sentence25: A 3 star hotel on the east side would be preferable. Sentence26: Their contact number is 07167487501. Is there anything else I can assist you with today? Sentence27: Since you say there are no 3 or 4 star hotels in the east, I will settle for the centre of town. Sentence28: I'm sorry there are no matches. Sentence29: Can you please provide me with information on the attraction cherry hinton hall and grounds? Sentence30: Gonville Hotel is a great hotel located in the centre. It's 3 stars and is in the expensive price range. Would you like me to book you a room? Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: The address is 451 Newmarket Road Fen Ditton. Unfortunately, the restaurant is fully booked. Do you have another restaurant or type of food in mind? Sentence2: Something in the same area and price range would work. Sentence3: Great. Thank you so much. Sentence4: Yes, I found what you're looking for. Would you like the address? Sentence5: Your booking was successful, the reference number is FYFXWH1Z . Is there anything else I can help you with today? Sentence6: Sure thing. I'll need a reference number too. Sentence7: I'm looking for a restaurant my friend recommended, I think she called it the Curry Prince. Sentence8: No that will be all for today. Thank you so much for your help. Sentence9: Sure, and can you book it for Friday at 12:00 for 3 people? Sentence10: You are very welcome. Is there anything else I can help you with today? Sentence11: You are welcome. Have a lovely day. Sentence12: I have rajmahal which is in the same area and price range. Would you like me to book a table there? Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]:
Answer: (B) System