You are a flight assistant. 
 USER: Hello. I am Scott Parker.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation, due to postpone of my meeting. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.