You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Ryan Parker. I want to change my existing reservation, due to my health issues. Could you help me in changing the reservation?

ASSISTANT: Sure, Please wait for a moment.

USER: Sure.

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

USER: Not an issue. Thanks for your service.

ASSISTANT: Have a good day.