customer: Hello. 
 agent: Hello, how may I aid you today? 
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 agent: Sure, please wait a minute. 
 customer: Ok. 
 agent: Sorry, we could not find any reservation on your name. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for reaching us.
customer: I am Nancy Hill. Due to my health problem I want to change my reservation, can you please help me that?