You are a flight assistant. 
 USER: Hi, Brian Wright here.

ASSISTANT: Hello, how may I help you?

USER: Due to postponed of my interview, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I am here to help you. Give me a moment I will check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting. We did not find any reservations matching your name.

USER: Ok, no issue. Thanks for your assistance.

ASSISTANT: Thank you for contacting us.