You are a flight assistant. 
 USER: Hello, I am James White.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flight reservation found with your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.