You are a flight assistant. 
 USER: Hellpo.

ASSISTANT: Hello, how can I assistyou?

USER: I would like to change my existing reservation due to my schedule got postponed.

ASSISTANT: Ok, may I know your name?

USER: Myself Stephanie Carter.

ASSISTANT: Ok, please wait. Sorry, no reservation found on your name to change.

USER: It's ok, anyway thank you for checking my reservation status.

ASSISTANT: Most welcome.