customer: Hello. I'm Karen Parker. 
 agent: Hello, how may I help you? 
 customer: My scheduled examination dates has been postponed. So, I would like to change my recent reservation which is under my name. Can you please help me with that? 
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 customer: Sure, take your time. 
 agent: Sorry, there is no reservation with your name to change further. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for choosing us.
agent: Sure, I will help you. Please wait for a while.