customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that? 
 agent: Let me know your name to check your reservation? 
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 agent: Sorry, we found no reservation on your given name. 
 customer: No problem, thank you for the information. 
 agent: Thank you for choosing us.
customer: I am David Carter.