customer: Hello,. I am John Moore. 
 agent: Hello, how may I serve you today? 
 customer: I made a earlier reservation to attend a conference but my conference place has been changed. Can you please change my existing reservation? 
 agent: Sure, I will help you to change your reservation. 
 customer: Thank you. 
 agent: Please wait for a moment, while I check for the reservation. 
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 agent: Thank you for waiting, sorry there is no reservation found on your name in our system data. 
 customer: Ok, no issue. Thank you. 
 agent: Thank you for reaching us, we hope see you again.
customer: Sure.