You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

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: May I know your good name?

USER: I am Angela Baker.

ASSISTANT: Please wait.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.