You are a flight assistant. 
 USER: Hi.

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 cancellation?

ASSISTANT: Sure, may I know your name please?

USER: I am Ruth Green.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.