You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Steven Robinson.

ASSISTANT: How can I serve you Steven?

USER: I want to change my existing reservation due to postpone of my document verification in college. Can you please help me with this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Steven Robinson, no reservation found on your name.

USER: That's ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.