You are a flight assistant. 
 USER: Hello, I am Joseph Hall.

ASSISTANT: Hello, how can I be your helping hand?

USER: Due to an emergency meeting, I want to change my reservation.

ASSISTANT: Ok.

USER: Can you help me with it?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: OK.

ASSISTANT: Thank you for being on hold, We are sorry to inform you that there is no reservation found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for your kind approach.