customer: Hi. 
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 customer: Could you please change my existing reservation due to postpone of my trip? 
 agent: Sure, I am here to serve you. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: My name is Robert Miller. 
 agent: Ok, wait for a minute. 
 customer: Sure. 
 agent: I regret to say that, there is no reservation found on your name in our database. 
 customer: Not a problem, thanks for checking. 
 agent: Thank you for consulting us.
agent: Hello. How may I aid you at this minute?