customer: Hello, I am Sandra Taylor. 
 agent: Hello, how may I aid you? 
 customer: I want to change an existing reservation, can you please help me in that? 
 agent: Sure, I am here to help you. Please wait for a while. 
 customer: Sure. 
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 customer: That's ok, not a problem. Thanks for your information. 
 agent: Thank you for choosing us.
agent: Thanks for your time, there is no active reservation found in your name.