customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I am Michael Young. 
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 customer: I need change my recent reservation due to postponed of my exams. 
 agent: Sure, Wait a minute. 
 customer: Ok. 
 agent: Sorry to tell that there is no reservation found on your name. 
 customer: Thanks for your information. 
 agent: Thank you for contacting us.
agent: Ok.