You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you please help me with changing my existing reservation? As, my exams are postponed.

ASSISTANT: How may I assist you?

USER: Please help me with changing my reservation.

ASSISTANT: Sure, I will help you in change of flight ticket reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My booking was done by the name of Patrick Edwards.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: No issues.

ASSISTANT: I have not found your flight reservation to change it.

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you.

USER: Most welcome.