customer: Hello. 
 agent: Hello. How can I assist you at this moment? 
 customer: I am Thomas Brown. 
 agent: Glad to meet you Brown. 
 customer: I want to change an existing reservation, due to health issue.Can you please change my reservation? 
 agent: Sure, I will help you with that. Can I have your good name to check existing reservation status? I mean on which name you booked earlier? 
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 agent: Ok, please wait a moment and I will check for existing reservation status. Thank you for waiting. 
 customer:  sure, take your time. 
 agent: Sorry Brown, there is no reservation found under your name to change. 
 customer: That's fine, thank you for your service. 
 agent: Most welcome. Thank you for choosing us.
customer: I mentioned above.