customer: Hello. 
 agent: Hello, how can I best support you today? 
 customer: I am Samuel Green. I want to change my existing reservation due to the change of my trip dates. Can you help me? 
 agent: We are here to help you. 
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 agent: Just give me a moment please. 
 customer: Sure. 
 agent: Sorry to say that there is no reservation found on your name. 
 customer: No problem. Thank you for your response. 
 agent: Thanks for connecting us, have a nice day.
customer: Thank you.