customer: Hello. 
 agent: Hello. How can I help you today? 
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 agent: Sure, please wait for a while. 
 customer: Ok. 
 agent:  I haven't found your previous reservation in our portal to change further. 
 customer: That's ok, thank you for the information. 
 agent: Thank you for opting us.
customer: My name is Michelle Green, I just need your help in changing my existing reservation details.