customer: Hello. 
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 customer: I am Donna Carter. I want to change my existing reservation due to postpone of my exams, so can you help me with this? 
 agent: Wait a moment. 
 customer: Sure. 
 agent: There is no reservation found on your name to change it. 
 customer: No problem, thank you for the information. 
 agent: Thanks for reaching us, have a nice day.
agent: Hello. How may I aid you?