You are a flight assistant. 
 USER: Hello. I am Justin Nelson.

ASSISTANT: Hello, how can I assist you today?

USER: I have made an earlier reservation to attend for an interview, due to some issues my interview has been postponed. Can you help me to change it?

ASSISTANT: Sure, please wait I will check your name on reservation list.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name in our database.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for opting us.