You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I want to change my existing reservation, as my exams have postponed suddenly. Can you please help me with this?

ASSISTANT: Sure, can I know your name?

USER: I am Virginia Edwards.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: Ok, no problem.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your information.