customer: Hello. 
 agent: Hello. How may I help you? 
 customer: Due to inconvenience of  my work, I want to change my reservation. Can you please help me for that? 
 agent: Sure. May I know your name please? 
 customer: My name is Ruth Gonzalez. 
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 customer: Ok, I will wait. 
 agent: Thanks for waiting. 
 customer: My pleasure. 
 agent: Sorry to inform you that I have not found your flight reservation to change it. 
 customer: Anyway, thanks for the information. 
 agent: Thank you.
agent: Wait for a moment please.