customer: Hi, I am Amanda Phillips. 
 agent: Hello, how can I serve you? 
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 agent: Sure, give me sometime to check and revert to you. 
 customer: Ok. 
 agent: Thank you for waiting. Unfortunately we didn't found any reservation according to your name. 
 customer: Ok, not an issue. Thank you. 
 agent: Thank you for opting us.
customer: I want to do some changes in the existing reservation because my friends are not able to come on those dates, can you help me in changing an existing reservation?