You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me?

ASSISTANT: Sure, I can help you and can I know your name please?

USER: My name is Helen Harris.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our date base.

USER: It's ok, thank you for your help.

ASSISTANT: You are most welcome and have a nice day.