You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Ryan Campbell. I want to change my existing reservation due to some personal issues, can you please help me with that?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

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

ASSISTANT: Thank you for making us to serve you.