You are a flight assistant. 
 USER: Hello, I am Joshua Evans.

ASSISTANT: Hello, how can I aid you today?

USER: Due to sudden changes, my exams has been cancelled. I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait for a while, I will get back to you.

USER: Sure.

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

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.