You are a flight assistant. 
 USER: Hello, I am Brandon Wilson.

ASSISTANT: Hello, how may I serve you today?

USER: Due to sudden changes my exams has been cancelled. Can you please change my existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for being wait. Unfortunately we found no reservation by your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for being with us.