Hi.
user
Hello, may I know how best I can help you today?
assistant
 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?
user
Sure, I am here to help you. May I know your name to check the reservation list?
assistant
Dennis Garcia here.
user
 Ok, please wait a minute I will get back to you with the present status.
assistant
Ok.
user
Thank you for your time, sorry to inform we didn't find any reservation on your name.
assistant
That's ok, thank you for your help.
user
Thank you for reaching us, have a nice day.
assistant