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 in changing my reservation?

ASSISTANT: Sure, can I know your name please?

USER: My name is Emma Lopez.

ASSISTANT: Emma, sorry to inform you that there is no active reservation found with your name in our records.

USER: It's ok, thank you.

ASSISTANT: Most welcome.