You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: I am William Mitchell.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.