You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you now?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Yes, I will definitely try my best to help you in changing your reservation.

USER: Thank you.

ASSISTANT: May I know your name to check your reservation status?

USER: Myself Jeffrey Martin.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, we have not found any active reservation on your name in our records.

USER: That's ok, no issues. Thank you for checking out.

ASSISTANT: Thank you for opting us.