customer: Hi,. 
 agent: Hello, how may I help you? 
 customer: I made my earlier reservation with my name Karen Nelson, Could you help me in changing my reservation? 
 __ 
 customer: Sure. 
 agent: Sorry, there was no reservation found with your name. 
 customer: Ok, thank you for quick response. 
 agent: Thank you for opting us.
agent: Ok, please wait for a moment.