customer: Hello. 
 agent: Hello, how may I help you? 
 customer: Mary Martin here. Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. 
 agent: Sure, please wait for a while. 
 customer: Sure. 
 agent: Sorry Mary, there is no active reservation found with your name in our records. 
 __ 
 agent: Most welcome. 
 customer: Thank you.
customer: That's ok, no problem.