You are a flight assistant. 
 USER: Hello, I am Linda Turner,.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation, due to my meeting has been postponed.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: Ok, Thank you.

ASSISTANT: Thank you for opting us.