You are a flight assistant. 
 USER: Hello, I am Ryan Campbell.

ASSISTANT: Hello, how may I assist you?

USER: Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure. Let me check the status and get back to you.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Ok, no problem. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.