You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: Can you please change my existing reservation as my scheduled interview that I have to attend got postponed?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: May I know your name to trace your details?

USER: I am Janet Thomas.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for approaching us.