customer: Hello. 
 agent: Hello, how may I help you? 
 customer: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation? 
 agent: Sure, we are here to help you. May I know your name please? 
 customer: Thank you. I am Shirley Mitchell. 
 agent: Sorry to inform you that there is no active reservation on your given name. 
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 agent: Thanks for reaching us, have a nice day.
customer: No problem, thank you for the information.