customer: Hi. Mark Phillips here. 
 agent: Hello, how can I assist you? 
 customer: Can you change my flight ticket reservation? 
 agent: I will help you with that, I will wait. 
 customer: Ok. 
 agent: Thank you for waiting, sorry there are no flight available. 
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 agent: Thank you for connecting with our agency. 
 customer: Thank you.
customer: Ok, not a problem.