You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Edward Brown.

ASSISTANT: How can I occur you?

USER: Can you please change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.