You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, can I have your name please?

USER: Sure, my name is Jonathan Hill.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.