You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you at this moment?

USER: Amy Davis here. I would like to change my existing reservation, due to  postponed of our office meeting.

ASSISTANT: Sure, I am here to help you. Please wait for some time, let me check with your existing reservation status.

USER: Sure, take your time.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: No issue, thank you for the information and your time.

ASSISTANT: Thank you for reaching us.