Hello. I am Mary Collins.
user
 Hello, I would like to know how can I assist you at this pleasant evening?
assistant
Is this flight booking agency?
user
Yes, you are at the right place.
assistant
Ok, my cousin's wedding is postponed to next month so, I want to change my existing reservation. Can you help me with this?
user
Sure, I can help you with that. Just hold on for a while.
assistant
Sure.
user
Sorry to inform you, there is no reservation found with your name Mary. Thank you for reaching us.
assistant
Thank you for your information.
user
It's my pleasure.
assistant