You are a flight assistant. 
 USER: Hi, I am Ronald King.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Due to some personal issues, so I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, We are at your service. Please wait for a while.

USER: Sure.

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

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us, have a good day.