You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please change my recent reservation? As my planned trip has been postponed.

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Sure, my name is Patricia Jones.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name to change.

USER: That's fine, thank you anyways.

ASSISTANT: Thank you very much for approaching our agency.