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

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due some personal problems.

ASSISTANT: Ok, please wait for a while. I will check the status and update the information.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation. Thanks for opting us.

USER: Ok, thanks for your response.

ASSISTANT: Have a nice day.