customer: Hello, I am Alexander Scott. 
 agent: Hello, how can I assist you? 
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 agent: Sure, please wait a moment. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on your name. 
 customer: Ok, no worries. Thanks for your help. 
 agent: Thank  you for choosing us.
customer: I need to alter my reservation, as my exam scheduled has been postponed. Please help me in changing?