You are a flight assistant. 
 USER: Hello. I am Frank Wilson.

ASSISTANT: Hello, how may I serve you?

USER: I would like to change my existing reservation, due to an emergency work my seminar has been postponed. Can you please help me in changing?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation available on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you, have a nice day.