customer: Hello. 
 agent: Hello. How may I help you? 
 customer: Actually I am trying to modify the details in my previous ticket which is booked in the last week but due to some server problem, I am not getting that. Can you please help me in changing? 
 agent: Sure, I am glad to assist you in modifying the ticket details. Can you please tell me your name? 
 customer: Sure, I am Donna Thomas. 
 agent: Ok. I am happy to inform you, I found your past ticket in our chart list. What are your changed travel dates? 
 customer: Sure, my planned trip dates are 12/23 and 12/25. 
 agent: Ok, can you please mention the airport codes that you prefer to travel? 
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 agent: Sorry to tell you, the flights are no running on the dates you have given because there is a cyclone effect in that area. 
 customer: Ok, not a problem. Anyway's thank you for your information. 
 agent: You are welcome. Have a nice day.
customer: Ok, my airport codes from IAH to MSP.