You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Patricia Green. I would like to alter my existing reservation, due to postpone of my interview date. Can you please assist me in changing?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there was no reservation found on your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.