customer: Hi. 
 agent: Hello. How can I help you? 
 customer:  I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation? 
 agent: Sure. Please let me know your name? 
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 agent: Let me check details with your recent reservation. 
 customer: Ok. 
 agent: Sorry, there is no reservation by your name. 
 customer: That's ok, thank you for your help. 
 agent: Thank you.
customer: John Gonzalez here.