You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, please share me your good name.

USER: Sure, I am Jeffrey Miller.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for opting  us.

USER: Thank you for your information.