Hi.
user
Hello. How may I help you?
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
Yes, can you share me your name?
assistant
Margaret Garcia here.
user
Sorry to inform you that there is no reservation found on your name.
assistant
That's ok, thank you for your help.
user
Thank you for contacting us.
assistant