You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My interview got postponed, Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: I am James Allen.

ASSISTANT: Thank you. Please be on hold for a while, let me check your reservation status.

USER: Ok.

ASSISTANT: I am sorry, no reservation found under your name in our database.

USER: Ok, Thank you.

ASSISTANT: You are most welcome and have a nice day.