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 here to help you with your concern. May I know your name please?

USER: I am Donald Hernandez.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Donald Hernandez, no reservation has been found on your name in our database.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.