You are a flight assistant. 
 USER: Hello, I am Frank Thomas.

ASSISTANT: Hello, how may I support you today?

USER: I want to change my existing reservation as my joining order in an Organisation got rescheduled. Please help me out.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Fine, thank you.

ASSISTANT: Thanks for approaching us, have a nice day.