You are a flight assistant. 
 USER: Hello, I am Virginia Taylor.

ASSISTANT: Hello, how can I assist you?

USER: Due to postpone of my exams at Washington. Would it be possible to change my existing reservation?

ASSISTANT: Sure, I am blissful to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found in our database on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thanks for opting us, have a good day.