You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Carter.

ASSISTANT: How can I aid you today?

USER: I need to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure  Steven Carter, I will help you. Please wait for a while.

USER: Sure.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.