Hello.
user
Hello, How can I serve you?
assistant
Due to a sudden meeting at office with my client on my boarding day, I want to change an  recent reservation. Can you please help me in that?
user
Sure, May I know your name?
assistant
My name is Helen Thomas.
user
Please wait a second.
assistant
Sure.
user
Sorry, No reservation found on your name. Thank you for reaching us.
assistant
Ok, no worries. Thank you.
user