You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Davis.

ASSISTANT: How can I help you today?

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

ASSISTANT: Sure, I am very happy to help you with that.

USER: Thank you.

ASSISTANT: Just give a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.