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 issue. Can you please help me out?

ASSISTANT: Sure, may I know your name for the changing process?

USER: My name is Stephanie Scott.

ASSISTANT: Sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.

USER: Welcome.