You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My name is Sarah Collins, and I have to change my reservation as I have to prepare for my exams, can you please help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please be on hold I will check and revert you.

USER: Ok, take your time.

ASSISTANT: We did not find any reservation on your name in our database to change it.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for availing us.