Hello.
user
Hello, how can I help you today?
assistant
My examination was postponed due to some reasons, so I want to change my travel dates in recent reservation, will you  help me in modifying the ticket?
user
Can I have your name, please?
assistant
My name is Pamela Phillips.
user
Sorry, there is no reservation found under your name. Thank you for reaching us.
assistant
That's fine, thank you for spending your valuable time.
user
You are welcome.
assistant