You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Roberts.

ASSISTANT: How can I assist you?

USER: As my exam is postponed, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, I will hep you with that. Give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No issue, thank you for checking.

ASSISTANT: Thank you, have a great day.