You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my reservation due to urgent meeting, can you help me?

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

USER: I am Jonathan White.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you very much for approaching our agency.