customer: Hello. I am Donald Parker. 
 agent: Hello, how can I help you today? 
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 agent: Sure, please wait for a moment. 
 customer: Ok. 
 agent: Sorry to say that, no reservation was found with your good name. 
 customer: Ok, not an issue. Thank you. 
 agent: Thank you for reaching us.
customer: Due to sudden work, I need to change my reservation. Can you please help me with it?