You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: My name is Stephanie Anderson.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation found on your name to change.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.