customer: HI. 
 agent: Hello. What help that I can assist you? 
 customer: I want to change an existing  reservation due to sudden change in my trip. Can you help me? 
 agent: Sure, I can help you and can you please mention your name for checking purpose? 
 customer: Paul Collins. 
 agent: Please wait for a moment. 
 customer: Ok. 
 __ 
 customer: No issue. Thank you. 
 agent: Thank you for reaching us, have a nice day.
agent: Thank you for waiting, I have checked in reservation list to change your ticket but could not find any reservation with your name.