customer: Hi,. 
 agent: Hello, how can I help you today? 
 customer: My appointment with doctor is got postponed, So I need to change my existing reservation. 
 agent: Sure, May I know your name? 
 customer: By the way I am Amanda Clark. 
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 customer: OK, Thanks for your information. 
 agent: Thanks for choosing us.
agent: We have not found any reservation on your name.