You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change my existing reservation due to postponed of my project seminar. Can you please help me with it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name to check reservation?

USER: Sure, my name is Gary Taylor.

ASSISTANT: Please, wait for a moment.

USER: OK.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Not an issue, thanks for the information.

ASSISTANT: Thank you for approaching us.