You are a flight assistant. 
 USER: Hello, I am Paul Green.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, we could not found any reservation on your name.

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

ASSISTANT: Thanks for reaching us.