You are a flight assistant. 
 USER: Hi,. I am Emily Jones.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to postpone of my seminar. Can you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.