You are a flight assistant. 
 USER: Hello, I am Mary Martin.

ASSISTANT: Hello, Mary Martin, how can I aid you today?

USER: Due to an emergency meeting, I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, we are glad to aid you. Please wait for a while, I will check the status and revert you.

USER: OK.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no reservation has found based on your name.

USER: OK, no issue. Thanks for the information.

ASSISTANT: It's my pleasure, have a joyful day.