You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER:  I want to change my existing reservation due to my client meeting got postponed. Can you help for this one?

ASSISTANT: I am here to help you about that. Can you please provide your name for checking the reservation status?

USER: Sure, Anthony Miller here.

ASSISTANT: Please wait for a while to check the reservation status. Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: No issues, thank you for the information.

ASSISTANT: You are welcome, thank you for reaching us.