You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I am Ruth Johnson. I need to change my recent reservation due to postpone of my conference meeting. Could you please help me in doing that?

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

USER: Sure.

ASSISTANT: Its unfortunate that there is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for approaching us.