customer: Hello, I'm Rachel Carter. 
 agent: Hello, how may I assist you? 
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 agent: Sure Carter, please wait a moment let me check the previous reservation on your name. 
 customer: Ok. 
 agent: Sorry Carter, there is no reservation found on your name. Do you have any other queries? 
 customer: That's ok, thank you. 
 agent: Welcome Carter. Thank you for reaching us.
customer: Due to the postponement of exams, I would like to change my existing reservation. Could you please help me out?