customer: Hi. 
 agent: Hello, how can I aid you? 
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 agent: Sure, may I know your name to proceed further? 
 customer: My name is Donna Adams. 
 agent: We regret to inform you that there is no active reservation found on your name to change. 
 customer: Not a problem, thank you. 
 agent: Thank you for contacting us.
customer: Could you please change my existing reservation due to postpone of my exams?