customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I am Donald Garcia. My business meeting is postponed, so I need your help me to change my existing recent reservation, can you help me? 
 agent: Donald, please wait for a moment. 
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 agent: I am sorry Donald, there is no reservation with your details. 
 customer: Thank you for your service. 
 agent: Thank you for contacting us.
customer: Ok.