You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Barbara Carter. My scheduled examination dates have been postponed, So I want to change my existing reservation.

ASSISTANT: Sure, give me a moment.

USER: Could you help me in changing. Ok.

ASSISTANT: Thank you for being patient. Unfortunately there is no reservation found with your name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for picking us and have a nice day.