You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid 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 Helen Smith.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.