customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Pamela Brown. I want to change my reservation, due to some health issue. Can you please help me? 
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 customer: Thank you. 
 agent: Sorry, there is no reservation found on your name to change. 
 customer: It's ok, thank you for checking. 
 agent: Welcome. Thank you for choosing us.
agent: Sure, I will help you to change your reservation.