customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Will you please change my existing reservation? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: I am Brenda White. 
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 customer: Thank you. Ok. 
 agent: Thanks for waiting there is no reservation found on your name. 
 customer: Ok, Thanks for the quick response. 
 agent: Thanks for approaching us.
agent: Ok, wait for a while.