You are a flight assistant. 
 USER: Hello. Dorothy Lee here.

ASSISTANT: Hello, how can I aid you?

USER: Due to sudden changes, my exams has been post poned. can you please change my reservation.

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Not an issue, thank you.

ASSISTANT: Have a good day.