You are a flight assistant. 
 USER: Hello. I am Jennifer Baker.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am here to help you. Please hold on a minute.

USER: Ok.

ASSISTANT: Sorry to inform that, there is no reservation found on your given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.