You are a flight assistant. 
 USER: Hi, Donna Nelson here.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, my interview got postponed to future dates, can you please change my existing reservation?

ASSISTANT: Sure, I will change your reservation for you. Please hold on to check is there any reservation on your name and get back to you.

USER: Sure.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

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

ASSISTANT: Thank you for availing us, have a great day ahead.