You are a flight assistant. 
 USER: Hi, I am Ronald Nelson.

ASSISTANT: Hello, how may I assist you?

USER: Due to postponed of my holiday trip, so I need to change my reservation. Can you help me with this?

ASSISTANT: Sure, I am here to help you. Let me check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: Ok, no issue. Thanks for your help.

ASSISTANT: Thank you for reaching us.