You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for today?

USER: I am Karen Smith.

ASSISTANT: Thank you for providing your good name.

USER: As my semester exams got postponed, I need to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure, we are here to oblige you.

USER: Thank you.

ASSISTANT: Please, wait a minute. I will be back and revert you.

USER: Sure.

ASSISTANT: Thank you for your valuable time. No reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.