customer: Hello, I am David King. 
 agent: Hello, how may I help you? 
 customer: As my manager did not approve my leave, I would like to change my reservation. 
 agent: Sure. Please let me a moment. 
 customer: Ok, take your time. 
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 customer: That's ok, thank you for checking. 
 agent: Welcome. Thank you for reaching us. 
 customer: Welcome.
agent: Sorry, there is no reservation found on your name.