You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sandra Hill. Can you please change my reservation as my business meeting has been postponed?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: No reservation found on your name. Sorry for inconvenience.

USER: Ok.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: No problem, Thank you.