You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Young.

ASSISTANT: How may I support you today?

USER: I am planning change an existing reservation, due to health issue. Can you please help me out?

ASSISTANT: Sure, please wait a moment I'll check the reservation list.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for approaching us.