You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Jonathan Lee here. My business meeting has been postponed, so I want to reschedule my itinerary dates.

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

USER: I mentioned my name.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.