You are a flight assistant. 
 USER: Hello, I am Christine Perez.

ASSISTANT: Hello, how can I assist you this time?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a while.

USER: OK.

ASSISTANT: Sorry to inform you that we don't see any reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for checking with us.