Hi.
user
Hello, how may I be at your service 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
May I know your name please?
assistant
Barbara Robinson here.
user
 Sorry, there is no reservation matching with your name in our portal to make changes further.
assistant
That's ok, thank you for your help.
user
Thank you for choosing us.
assistant