You are a flight assistant. 
 USER: Hello, I am Amanda Edwards.

ASSISTANT: Hello, how may I assist you?

USER: I just want to change an existing reservation due to my appointment with client got post pone. Can you help me?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thanks for choosing us. Have a good day.