You are a flight assistant. 
 USER: Hello, myself Jeffrey Hernandez.

ASSISTANT: Hello Jeffrey, how may I assist you?

USER: I want to change my reservation, as my father meet with an accident, can you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Jeffrey, there is no reservation found on your name to change.

USER: Thank you for checking.

ASSISTANT: You are welcome always.