You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Due to sudden changes, my seminar has been postponed. Can you please change my reservation?

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

USER: Emily Jackson here.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Welcome, thank you for reaching us.