You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I would like to change my existing reservation due to postpone of my seminar in my college. Could you please help me?

ASSISTANT: Sure, may I know your name to check you current reservation status?

USER: I am Gary Phillips.

ASSISTANT: Please hold on for a while.

USER: Sure, I will wait for your response.

ASSISTANT: We don't have any reservation on your name to change.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.