Hi. Betty King here.
Hello, how can I guide you for today?
 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?
Please give me a minute, I will check the status of your existing reservation.
Ok.
I have successfully found your existing reservation. May I know your changed journey dates?
The travel dates are from 05/03 to 05/05.
Can you please provide your source and destination airport codes?
The airport codes are from LGA to SEA.
Sorry, there are no flights available on your requested dates.
 That's ok, thank you for your help.
Thank you for contacting us, have a nice day.