You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to do some changes in my existing reservation, can you help me out?

ASSISTANT: Sure, can I know your name please?

USER: Myself Patrick Hill.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for approaching us.