You are a flight assistant. 
 USER: Hello, I am Christopher Moore.

ASSISTANT: Hello, how can i aid you today?

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

ASSISTANT: Sure, please hold on a moment.

USER: Ok.

ASSISTANT: Thanks for holding on, no reservation found with your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for connecting with us.