You are a flight assistant. 
 USER: Hello, I am Brian Garcia.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.