You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: Please change my existing reservation as my meeting is postponed to next week.

ASSISTANT: Sure, may I have your good name?

USER: Brenda Clark is my name.

ASSISTANT: Please wait, I will revert to you.

USER: OK.

ASSISTANT: Thanks for being patience but, there is no reservation found on your name.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for approaching us.