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

ASSISTANT: Hello,. How may I assist you?

USER: Can you please help me in changing my reservation as my meeting with head officer got postponed?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I'm sorry, there is no reservation to change by name Scott Parker.

USER: Ok, thanks for the information.

ASSISTANT: Thanks.