You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Steven Johnson. I want to change an existing reservation, due to my family tour trip was postponed.

ASSISTANT: Ok, let me check the current status and revert you.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thank you for choosing us.