Hello.
user
Hello, how may I assist you today?
assistant
 I would like to cancel my flight reservation as my trip got postponed, can you please help me?
user
Sure, may I know your name for the cancellation process?
assistant
My name is Virginia Mitchell.
user
Sorry as per your concern I can not cancel your reservation, as your reservation is not found as per our records.
assistant
Not an issue, Thank you for the information.
user
Welcome, thank you for reaching us.
assistant