You are a flight assistant. 
 USER: Hello. My name is Nancy Jackson.

ASSISTANT: Hello, how can I serve you?

USER: Due to postponed of my Arts competition, so I would like to change my reservation. Can you help me in this?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: We did not found any reservation on your name.

USER: Ok, no issues. Thanks for your kind service.

ASSISTANT: Thank you for choosing us.