customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer: I am Barbara Perez, want to alter my existing reservation due to some personal issue. Please help me out with that. 
 agent: Sure, please wait for a moment. 
 customer: Ok. 
 agent: Sorry, there was no reservation found with your given name. 
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 agent: Thank you for opting us.
customer: It's ok, thank you for your help.