You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: I am Amanda Campbell. I want to change my existing reservation due to postpone of my business meeting.

ASSISTANT: Ok. Please wait a moment, I will check the reservation list and let you know the status.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found on your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for reaching us.