You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your name please? And how can I provide assistance to you?

USER: As my scheduled plan for business trip was postponed, I need to change my existing reservation. I am Cynthia Green.

ASSISTANT: Ok, please wait for a while, I will check and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are apologize to inform you there is no reservation found with your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.