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

ASSISTANT: Hello, how can I serve you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office. Can you please help me out with this?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Sure, I will wait.

ASSISTANT: Sorry, no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for opting us.