customer: Hello. Sandra Jones here. 
 agent: Hello, how can I serve you today? 
 customer: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that? 
 agent: Sure, I will help you. Please wait for a while. 
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 agent: Thanks for waiting, there is no active reservation found on your name. 
 customer: Anyway, thanks for the information. 
 agent: Thank you for availing us, hope to serve you again.
customer: Ok, I will wait.