You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Here Jonathan Nelson. I would like to change my recent reservation due to my health is not good.

ASSISTANT: Sure, I am here to help you. Please wait a moment I will check your details and proceed further.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.