You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist  you today?

USER: My interview has been postponed due to some issues. Can you please change my existing reservation?

ASSISTANT: Sure, could you please provide your name to proceed further?

USER: Joseph White.

ASSISTANT: Ok, please wait a moment, let me check your reservation with us.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry, unfortunately no reservation found with your name.

USER: Ok, it's not a problem. Thanks for your assistance.

ASSISTANT: Thanks for your interest.