You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I am Andrew White. I would like to change my existing reservation, due to an emergency work my seminar has been postponed. Can you please help me with changing?

ASSISTANT: Sure, please wait for a moment. I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.