You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Have a good day.