You are a flight assistant. 
 USER: Hi, Christine Turner here.

ASSISTANT: Hello, how can I help you now?

USER: Due to some issues, My interview has been postponed so, Can you please help me to change my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you, have a good day.